what was the underlying cause of world war 1 essay

5 Key Causes of World War I

Illustration by Hugo Lin. ThoughtCo.

• M.A., History, University of Florida
• B.A., History, University of Florida

World War I, known as the "war to end all wars," occurred between July 1914 and November 11, 1918. By the end of the war, over 17 million people had been killed, including over 100,000 American troops. While the causes of the war are infinitely more complicated than a simple timeline of events, and are still debated and discussed to this day, the list below provides an overview of the most frequently-cited events that led to war. 

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Mutual defense alliances.

Countries throughout the world have always made mutual defense agreements with their neighbors, treaties that could pull them into battle. These treaties meant that if one country was attacked, the allied countries were bound to defend them. Before World War 1 began, the following alliances existed:

• Russia and Serbia
• Germany and Austria-Hungary
• France and Russia
• Britain and France and Belgium
• Japan and Britain

When Austria-Hungary declared war on Serbia, Russia got involved to defend Serbia. Germany, seeing that Russia was mobilizing, declared war on Russia. France was then drawn in against Germany and Austria-Hungary. Germany attacked France by marching through Belgium pulling Britain into war. Then Japan entered the war to support its British allies. Later, Italy and the United States would enter on the side of the Allies (Britain, France, Russia, etc.).

Imperialism

Imperialism is when a country increases their power and wealth by bringing additional territories under their control, usually without outright colonizing or resettling them. Before World War I, several European countries had made competing imperialistic claims in Africa and parts of Asia, making them points of contention. Because of the raw materials these areas could provide, tensions around which country had the right to exploit these areas ran high. The increasing competition and desire for greater empires led to an increase in confrontation that helped push the world into World War I.

As the world entered the 20th century, an arms race had begun, primarily over the number of each country's warships, and the increasing size of their armies—countries began training more and more of their young men to be prepared for battle. The warships themselves increased in size, number of guns, speed, method of propulsion, and quality armor, beginning in 1906 with Britain's HMS Dreadnought . Dreadnought   was soon out-classed as the Royal Navy and Kaiserliche Marine quickly expanded their ranks with increasingly modern and powerful warships. 

By 1914, Germany had nearly 100 warships and two million trained soldiers. Great Britain and Germany both greatly increased their navies in this time period. Further, in Germany and Russia particularly, the military establishment began to have a greater influence on public policy. This increase in militarism helped push the countries involved into war.

Nationalism

Much of the origin of the war was based on the desire of the Slavic peoples in Bosnia and Herzegovina to no longer be part of Austria-Hungary but instead be part of Serbia. This specific essentially nationalistic and ethnic revolt led directly to the assassination of Archduke Ferdinand , which was the event that tipped the scales to war.

But more generally, nationalism in many of the countries throughout Europe contributed not only to the beginning but to the extension of the war across Europe and into Asia. As each country tried to prove their dominance and power, the war became more complicated and prolonged.

Immediate Cause: Assassination of Archduke Franz Ferdinand

The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, and nationalism) was the assassination of Archduke Franz Ferdinand  of Austria-Hungary. In June 1914, a Serbian-nationalist terrorist group called the Black Hand sent groups to assassinate the Archduke. Their first attempt failed when a driver avoided a grenade thrown at their car. However, later that day a Serbian nationalist named Gavrilo Princip shot the Archduke and his wife while they were driving through Sarajevo, Bosnia which was part of Austria-Hungary. They died of their wounds.

The assassination was in protest to Austria-Hungary having control of this region: Serbia wanted to take over Bosnia and Herzegovina. The assassination of Ferdinand led to Austria-Hungary declaring war on Serbia. When Russia began to mobilize to defend its alliance with Serbia, Germany declared war on Russia. Thus began the expansion of the war to include all those involved in the mutual defense alliances.

The War to End All Wars

World War I saw a change in warfare, from the hand-to-hand style of older wars to the inclusion of weapons that used technology and removed the individual from close combat. The war had extremely high casualties over 15 million dead and 20 million injured. The face of warfare would never be the same again.

• Causes of World War I and the Rise of Germany
• The Assassination of Archduke Franz Ferdinand, 1914
• World War I Timeline From 1914 to 1919
• Biography of Franz Ferdinand, Archduke of Austria
• The Causes and War Aims of World War One
• World War I Timeline: 1914, The War Begins
• World War I Introduction and Overview
• World War 1: A Short Timeline Pre-1914
• The Major Alliances of World War I
• World War I: Opening Campaigns
• The First Battle of the Marne
• The Fourteen Points of Woodrow Wilson's Plan for Peace
• Key Historical Figures of World War I
• The Black Hand: Serbian Terrorists Spark WWI
• The Consequences of World War I

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World War I

By: History.com Editors

Updated: August 11, 2023 | Original: October 29, 2009

World War I, also known as the Great War, started in 1914 after the assassination of Archduke Franz Ferdinand of Austria. His murder catapulted into a war across Europe that lasted until 1918. During the four-year conflict, Germany, Austria-Hungary, Bulgaria and the Ottoman Empire (the Central Powers) fought against Great Britain, France, Russia, Italy, Romania, Canada, Japan and the United States (the Allied Powers). Thanks to new military technologies and the horrors of trench warfare, World War I saw unprecedented levels of carnage and destruction. By the time the war was over and the Allied Powers had won, more than 16 million people—soldiers and civilians alike—were dead.

Archduke Franz Ferdinand

Tensions had been brewing throughout Europe—especially in the troubled Balkan region of southeast Europe—for years before World War I actually broke out.

A number of alliances involving European powers, the Ottoman Empire , Russia and other parties had existed for years, but political instability in the Balkans (particularly Bosnia, Serbia and Herzegovina) threatened to destroy these agreements.

The spark that ignited World War I was struck in Sarajevo, Bosnia, where Archduke Franz Ferdinand —heir to the Austro-Hungarian Empire—was shot to death along with his wife, Sophie, by the Serbian nationalist Gavrilo Princip on June 28, 1914. Princip and other nationalists were struggling to end Austro-Hungarian rule over Bosnia and Herzegovina.

The assassination of Franz Ferdinand set off a rapidly escalating chain of events: Austria-Hungary , like many countries around the world, blamed the Serbian government for the attack and hoped to use the incident as justification for settling the question of Serbian nationalism once and for all.

Kaiser Wilhelm II

Because mighty Russia supported Serbia, Austria-Hungary waited to declare war until its leaders received assurance from German leader Kaiser Wilhelm II that Germany would support their cause. Austro-Hungarian leaders feared that a Russian intervention would involve Russia’s ally, France, and possibly Great Britain as well.

On July 5, Kaiser Wilhelm secretly pledged his support, giving Austria-Hungary a so-called carte blanche, or “blank check” assurance of Germany’s backing in the case of war. The Dual Monarchy of Austria-Hungary then sent an ultimatum to Serbia, with such harsh terms as to make it almost impossible to accept.

World War I Begins

Convinced that Austria-Hungary was readying for war, the Serbian government ordered the Serbian army to mobilize and appealed to Russia for assistance. On July 28, Austria-Hungary declared war on Serbia, and the tenuous peace between Europe’s great powers quickly collapsed.

Within a week, Russia, Belgium, France, Great Britain and Serbia had lined up against Austria-Hungary and Germany, and World War I had begun.

The Western Front

According to an aggressive military strategy known as the Schlieffen Plan (named for its mastermind, German Field Marshal Alfred von Schlieffen ), Germany began fighting World War I on two fronts, invading France through neutral Belgium in the west and confronting Russia in the east.

On August 4, 1914, German troops crossed the border into Belgium. In the first battle of World War I, the Germans assaulted the heavily fortified city of Liege , using the most powerful weapons in their arsenal—enormous siege cannons—to capture the city by August 15. The Germans left death and destruction in their wake as they advanced through Belgium toward France, shooting civilians and executing a Belgian priest they had accused of inciting civilian resistance. 

First Battle of the Marne

In the First Battle of the Marne , fought from September 6-9, 1914, French and British forces confronted the invading German army, which had by then penetrated deep into northeastern France, within 30 miles of Paris. The Allied troops checked the German advance and mounted a successful counterattack, driving the Germans back to the north of the Aisne River.

The defeat meant the end of German plans for a quick victory in France. Both sides dug into trenches , and the Western Front was the setting for a hellish war of attrition that would last more than three years.

Particularly long and costly battles in this campaign were fought at Verdun (February-December 1916) and the Battle of the Somme (July-November 1916). German and French troops suffered close to a million casualties in the Battle of Verdun alone.

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World War I Books and Art

The bloodshed on the battlefields of the Western Front, and the difficulties its soldiers had for years after the fighting had ended, inspired such works of art as “ All Quiet on the Western Front ” by Erich Maria Remarque and “ In Flanders Fields ” by Canadian doctor Lieutenant-Colonel John McCrae . In the latter poem, McCrae writes from the perspective of the fallen soldiers:

Published in 1915, the poem inspired the use of the poppy as a symbol of remembrance.

Visual artists like Otto Dix of Germany and British painters Wyndham Lewis, Paul Nash and David Bomberg used their firsthand experience as soldiers in World War I to create their art, capturing the anguish of trench warfare and exploring the themes of technology, violence and landscapes decimated by war.

The Eastern Front

On the Eastern Front of World War I, Russian forces invaded the German-held regions of East Prussia and Poland but were stopped short by German and Austrian forces at the Battle of Tannenberg in late August 1914.

Despite that victory, Russia’s assault forced Germany to move two corps from the Western Front to the Eastern, contributing to the German loss in the Battle of the Marne.

Combined with the fierce Allied resistance in France, the ability of Russia’s huge war machine to mobilize relatively quickly in the east ensured a longer, more grueling conflict instead of the quick victory Germany had hoped to win under the Schlieffen Plan .

Russian Revolution

From 1914 to 1916, Russia’s army mounted several offensives on World War I’s Eastern Front but was unable to break through German lines.

Defeat on the battlefield, combined with economic instability and the scarcity of food and other essentials, led to mounting discontent among the bulk of Russia’s population, especially the poverty-stricken workers and peasants. This increased hostility was directed toward the imperial regime of Czar Nicholas II and his unpopular German-born wife, Alexandra.

Russia’s simmering instability exploded in the Russian Revolution of 1917, spearheaded by Vladimir Lenin and the Bolsheviks , which ended czarist rule and brought a halt to Russian participation in World War I.

Russia reached an armistice with the Central Powers in early December 1917, freeing German troops to face the remaining Allies on the Western Front.

America Enters World War I

At the outbreak of fighting in 1914, the United States remained on the sidelines of World War I, adopting the policy of neutrality favored by President Woodrow Wilson while continuing to engage in commerce and shipping with European countries on both sides of the conflict.

Neutrality, however, it was increasingly difficult to maintain in the face of Germany’s unchecked submarine aggression against neutral ships, including those carrying passengers. In 1915, Germany declared the waters surrounding the British Isles to be a war zone, and German U-boats sunk several commercial and passenger vessels, including some U.S. ships.

Widespread protest over the sinking by U-boat of the British ocean liner Lusitania —traveling from New York to Liverpool, England with hundreds of American passengers onboard—in May 1915 helped turn the tide of American public opinion against Germany. In February 1917, Congress passed a $250 million arms appropriations bill intended to make the United States ready for war.

Germany sunk four more U.S. merchant ships the following month, and on April 2 Woodrow Wilson appeared before Congress and called for a declaration of war against Germany.

Gallipoli Campaign

With World War I having effectively settled into a stalemate in Europe, the Allies attempted to score a victory against the Ottoman Empire, which entered the conflict on the side of the Central Powers in late 1914.

After a failed attack on the Dardanelles (the strait linking the Sea of Marmara with the Aegean Sea), Allied forces led by Britain launched a large-scale land invasion of the Gallipoli Peninsula in April 1915. The invasion also proved a dismal failure, and in January 1916 Allied forces staged a full retreat from the shores of the peninsula after suffering 250,000 casualties.

Did you know? The young Winston Churchill, then first lord of the British Admiralty, resigned his command after the failed Gallipoli campaign in 1916, accepting a commission with an infantry battalion in France.

British-led forces also combated the Ottoman Turks in Egypt and Mesopotamia , while in northern Italy, Austrian and Italian troops faced off in a series of 12 battles along the Isonzo River, located at the border between the two nations.

Battle of the Isonzo

The First Battle of the Isonzo took place in the late spring of 1915, soon after Italy’s entrance into the war on the Allied side. In the Twelfth Battle of the Isonzo, also known as the Battle of Caporetto (October 1917), German reinforcements helped Austria-Hungary win a decisive victory.

After Caporetto, Italy’s allies jumped in to offer increased assistance. British and French—and later, American—troops arrived in the region, and the Allies began to take back the Italian Front.

World War I at Sea

In the years before World War I, the superiority of Britain’s Royal Navy was unchallenged by any other nation’s fleet, but the Imperial German Navy had made substantial strides in closing the gap between the two naval powers. Germany’s strength on the high seas was also aided by its lethal fleet of U-boat submarines.

After the Battle of Dogger Bank in January 1915, in which the British mounted a surprise attack on German ships in the North Sea, the German navy chose not to confront Britain’s mighty Royal Navy in a major battle for more than a year, preferring to rest the bulk of its naval strategy on its U-boats.

The biggest naval engagement of World War I, the Battle of Jutland (May 1916) left British naval superiority on the North Sea intact, and Germany would make no further attempts to break an Allied naval blockade for the remainder of the war.

World War I Planes

World War I was the first major conflict to harness the power of planes. Though not as impactful as the British Royal Navy or Germany’s U-boats, the use of planes in World War I presaged their later, pivotal role in military conflicts around the globe.

At the dawn of World War I, aviation was a relatively new field; the Wright brothers took their first sustained flight just eleven years before, in 1903. Aircraft were initially used primarily for reconnaissance missions. During the First Battle of the Marne, information passed from pilots allowed the allies to exploit weak spots in the German lines, helping the Allies to push Germany out of France.

The first machine guns were successfully mounted on planes in June of 1912 in the United States, but were imperfect; if timed incorrectly, a bullet could easily destroy the propeller of the plane it came from. The Morane-Saulnier L, a French plane, provided a solution: The propeller was armored with deflector wedges that prevented bullets from hitting it. The Morane-Saulnier Type L was used by the French, the British Royal Flying Corps (part of the Army), the British Royal Navy Air Service and the Imperial Russian Air Service. The British Bristol Type 22 was another popular model used for both reconnaissance work and as a fighter plane.

Dutch inventor Anthony Fokker improved upon the French deflector system in 1915. His “interrupter” synchronized the firing of the guns with the plane’s propeller to avoid collisions. Though his most popular plane during WWI was the single-seat Fokker Eindecker, Fokker created over 40 kinds of airplanes for the Germans.

The Allies debuted the Handley-Page HP O/400, the first two-engine bomber, in 1915. As aerial technology progressed, long-range heavy bombers like Germany’s Gotha G.V. (first introduced in 1917) were used to strike cities like London. Their speed and maneuverability proved to be far deadlier than Germany’s earlier Zeppelin raids.

By the war’s end, the Allies were producing five times more aircraft than the Germans. On April 1, 1918, the British created the Royal Air Force, or RAF, the first air force to be a separate military branch independent from the navy or army. 

Second Battle of the Marne

With Germany able to build up its strength on the Western Front after the armistice with Russia, Allied troops struggled to hold off another German offensive until promised reinforcements from the United States were able to arrive.

On July 15, 1918, German troops launched what would become the last German offensive of the war, attacking French forces (joined by 85,000 American troops as well as some of the British Expeditionary Force) in the Second Battle of the Marne . The Allies successfully pushed back the German offensive and launched their own counteroffensive just three days later.

After suffering massive casualties, Germany was forced to call off a planned offensive further north, in the Flanders region stretching between France and Belgium, which was envisioned as Germany’s best hope of victory.

The Second Battle of the Marne turned the tide of war decisively towards the Allies, who were able to regain much of France and Belgium in the months that followed.

The Harlem Hellfighters and Other All-Black Regiments

By the time World War I began, there were four all-Black regiments in the U.S. military: the 24th and 25th Infantry and the 9th and 10th Cavalry. All four regiments comprised of celebrated soldiers who fought in the Spanish-American War and American-Indian Wars , and served in the American territories. But they were not deployed for overseas combat in World War I. 

Blacks serving alongside white soldiers on the front lines in Europe was inconceivable to the U.S. military. Instead, the first African American troops sent overseas served in segregated labor battalions, restricted to menial roles in the Army and Navy, and shutout of the Marines, entirely. Their duties mostly included unloading ships, transporting materials from train depots, bases and ports, digging trenches, cooking and maintenance, removing barbed wire and inoperable equipment, and burying soldiers.

Facing criticism from the Black community and civil rights organizations for its quotas and treatment of African American soldiers in the war effort, the military formed two Black combat units in 1917, the 92nd and 93rd Divisions . Trained separately and inadequately in the United States, the divisions fared differently in the war. The 92nd faced criticism for their performance in the Meuse-Argonne campaign in September 1918. The 93rd Division, however, had more success. 

With dwindling armies, France asked America for reinforcements, and General John Pershing , commander of the American Expeditionary Forces, sent regiments in the 93 Division to over, since France had experience fighting alongside Black soldiers from their Senegalese French Colonial army. The 93 Division’s 369 regiment, nicknamed the Harlem Hellfighters , fought so gallantly, with a total of 191 days on the front lines, longer than any AEF regiment, that France awarded them the Croix de Guerre for their heroism. More than 350,000 African American soldiers would serve in World War I in various capacities.

Toward Armistice

By the fall of 1918, the Central Powers were unraveling on all fronts.

Despite the Turkish victory at Gallipoli, later defeats by invading forces and an Arab revolt that destroyed the Ottoman economy and devastated its land, and the Turks signed a treaty with the Allies in late October 1918.

Austria-Hungary, dissolving from within due to growing nationalist movements among its diverse population, reached an armistice on November 4. Facing dwindling resources on the battlefield, discontent on the homefront and the surrender of its allies, Germany was finally forced to seek an armistice on November 11, 1918, ending World War I.

Treaty of Versailles

At the Paris Peace Conference in 1919, Allied leaders stated their desire to build a post-war world that would safeguard itself against future conflicts of such a devastating scale.

Some hopeful participants had even begun calling World War I “the War to End All Wars.” But the Treaty of Versailles , signed on June 28, 1919, would not achieve that lofty goal.

Saddled with war guilt, heavy reparations and denied entrance into the League of Nations , Germany felt tricked into signing the treaty, having believed any peace would be a “peace without victory,” as put forward by President Wilson in his famous Fourteen Points speech of January 1918.

As the years passed, hatred of the Versailles treaty and its authors settled into a smoldering resentment in Germany that would, two decades later, be counted among the causes of World War II .

World War I Casualties

World War I took the lives of more than 9 million soldiers; 21 million more were wounded. Civilian casualties numbered close to 10 million. The two nations most affected were Germany and France, each of which sent some 80 percent of their male populations between the ages of 15 and 49 into battle.

The political disruption surrounding World War I also contributed to the fall of four venerable imperial dynasties: Germany, Austria-Hungary, Russia and Turkey.

Legacy of World War I

World War I brought about massive social upheaval, as millions of women entered the workforce to replace men who went to war and those who never came back. The first global war also helped to spread one of the world’s deadliest global pandemics, the Spanish flu epidemic of 1918, which killed an estimated 20 to 50 million people.

World War I has also been referred to as “the first modern war.” Many of the technologies now associated with military conflict—machine guns, tanks , aerial combat and radio communications—were introduced on a massive scale during World War I.

The severe effects that chemical weapons such as mustard gas and phosgene had on soldiers and civilians during World War I galvanized public and military attitudes against their continued use. The Geneva Convention agreements, signed in 1925, restricted the use of chemical and biological agents in warfare and remain in effect today.

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The History Hit Miscellany of Facts, Figures and Fascinating Finds

• 20th Century

The 4 M-A-I-N Causes of World War One

Alex Browne

28 sep 2021.

It’s possibly the single most pondered question in history – what caused World War One? It wasn’t, like in World War Two, a case of a single belligerent pushing others to take a military stand. It didn’t have the moral vindication of resisting a tyrant.

Rather, a delicate but toxic balance of structural forces created a dry tinder that was lit by the assassination of Archduke Franz Ferdinand in Sarajevo . That event precipitated the July Crisis, which saw the major European powers hurtle toward open conflict.

The M-A-I-N acronym – militarism, alliances, imperialism and nationalism – is often used to analyse the war, and each of these reasons are cited to be the 4 main causes of World War One. It’s simplistic but provides a useful framework.

The late nineteenth century was an era of military competition, particularly between the major European powers. The policy of building a stronger military was judged relative to neighbours, creating a culture of paranoia that heightened the search for alliances. It was fed by the cultural belief that war is good for nations.

Germany in particular looked to expand its navy. However, the ‘naval race’ was never a real contest – the British always s maintained naval superiority.  But the British obsession with naval dominance was strong. Government rhetoric exaggerated military expansionism.  A simple naivety in the potential scale and bloodshed of a European war prevented several governments from checking their aggression.

A web of alliances developed in Europe between 1870 and 1914 , effectively creating two camps bound by commitments to maintain sovereignty or intervene militarily – the Triple Entente and the Triple Alliance.

• The Triple Alliance of 1882 linked Germany, Austria-Hungary and Italy.
• The Triple Entente of 1907 linked France, Britain and Russia.

A historic point of conflict between Austria Hungary and Russia was over their incompatible Balkan interests, and France had a deep suspicion of Germany rooted in their defeat in the 1870 war.

The alliance system primarily came about because after 1870 Germany, under Bismarck, set a precedent by playing its neighbours’ imperial endeavours off one another, in order to maintain a balance of power within Europe

‘Hark! hark! the dogs do bark!’, satirical map of Europe. 1914

Image Credit: Paul K, CC BY 2.0 , via Wikimedia Commons

Imperialism

Imperial competition also pushed the countries towards adopting alliances. Colonies were units of exchange that could be bargained without significantly affecting the metro-pole. They also brought nations who would otherwise not interact into conflict and agreement. For example, the Russo-Japanese War (1905) over aspirations in China, helped bring the Triple Entente into being.

It has been suggested that Germany was motivated by imperial ambitions to invade Belgium and France. Certainly the expansion of the British and French empires, fired by the rise of industrialism and the pursuit of new markets, caused some resentment in Germany, and the pursuit of a short, aborted imperial policy in the late nineteenth century.

However the suggestion that Germany wanted to create a European empire in 1914 is not supported by the pre-war rhetoric and strategy.

Nationalism

Nationalism was also a new and powerful source of tension in Europe. It was tied to militarism, and clashed with the interests of the imperial powers in Europe. Nationalism created new areas of interest over which nations could compete.

For example, The Habsburg empire was tottering agglomeration of 11 different nationalities, with large slavic populations in Galicia and the Balkans whose nationalist aspirations ran counter to imperial cohesion. Nationalism in the Balkan’s also piqued Russia’s historic interest in the region.

Indeed, Serbian nationalism created the trigger cause of the conflict – the assassination of the heir to the Austro-Hungarian throne, Archduke Franz Ferdinand.

The spark: the assassination

Ferdinand and his wife were murdered in Sarajevo by Gavrilo Princip, a member of the Bosnian Serbian nationalist terrorist organization the ‘Black Hand Gang.’ Ferdinand’s death, which was interpreted as a product of official Serbian policy, created the July Crisis – a month of diplomatic and governmental miscalculations that saw a domino effect of war declarations initiated.

The historical dialogue on this issue is vast and distorted by substantial biases. Vague and undefined schemes of reckless expansion were imputed to the German leadership in the immediate aftermath of the war with the ‘war-guilt’ clause. The notion that Germany was bursting with newfound strength, proud of her abilities and eager to showcase them, was overplayed.

The first page of the edition of the ‘Domenica del Corriere’, an Italian paper, with a drawing by Achille Beltrame depicting Gavrilo Princip killing Archduke Franz Ferdinand of Austria in Sarajevo

Image Credit: Achille Beltrame, Public domain, via Wikimedia Commons

The almost laughable rationalization of British imperial power as ‘necessary’ or ‘civilizing’ didn’t translate to German imperialism, which was ‘aggressive’ and ‘expansionist.’ There is an on-going historical discussion on who if anyone was most culpable.

Blame has been directed at every single combatant at one point or another, and some have said that all the major governments considered a golden opportunity for increasing popularity at home.

The Schlieffen plan could be blamed for bringing Britain into the war, the scale of the war could be blamed on Russia as the first big country to mobilise, inherent rivalries between imperialism and capitalism could be blamed for polarising the combatants. AJP Taylor’s ‘timetable theory’ emphasises the delicate, highly complex plans involved in mobilization which prompted ostensibly aggressive military preparations.

Every point has some merit, but in the end what proved most devastating was the combination of an alliance network with the widespread, misguided belief that war is good for nations, and that the best way to fight a modern war was to attack. That the war was inevitable is questionable, but certainly the notion of glorious war, of war as a good for nation-building, was strong pre-1914. By the end of the war, it was dead.

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The History of Advent

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World History Project - Origins to the Present

Course: world history project - origins to the present   >   unit 7, read: what caused the first world war.

• BEFORE YOU WATCH: Britain and World War I
• WATCH: Britain and World War I
• BEFORE YOU WATCH: Southeast Asia and World War I
• WATCH: Southeast Asia and World War I
• BEFORE YOU WATCH: The Middle East and World War I
• WATCH: The Middle East and World War I
• BEFORE YOU WATCH: How World War I Started
• WATCH: How World War I Started
• READ: The First World War as a Global War
• READ: World War I — A Total War
• READ: The Mexican Revolution
• READ: The Power of One — The Russian Revolution
• BEFORE YOU WATCH: Armenian Genocide
• WATCH: Armenian Genocide
• READ: Capitalism and World War I
• World War 1

First read: preview and skimming for gist

Second read: key ideas and understanding content.

• Who killed Franz Ferdinand? Why did they kill him?
• How did the European alliance system help start the war?
• How did imperialism help start the war?
• Why does the author argue that industrialization made the war inevitable once preparations were started?
• How might the First World War have happened on accident?

Third read: evaluating and corroborating

• This article gives several examples of how transformations in the nineteenth century led to the war. Things like nationalism (communities frame), industrialization (production and distribution frame), and outdated diplomatic technology (networks frame) are blamed for the war. Can you think of any transformations during the nineteenth century that might have helped prevent war?

What Caused the First World War?

World war why, one shot: the assassination of archduke franz ferdinand, deeper trends: help me help you help me, accidental war: missed the memo, hit the target.

• Yes, these terms can get confusing. Nationalism was introduced to you as the idea that a state should govern itself, and not have some empire as its boss. But at some point, that feeling that you should get to govern yourself can turn into the idea that you are better than other nations, and becomes a kind of extreme patriotism. We call that nationalism as well. As we will see, nationalism is a pretty flexible thing, and it can be used for lots of different purposes.
• Top map by Joe Mabel, CC BY-SA 3.0. https://commons.wikimedia.org/wiki/File:Map_of_the_German_Empire_-_1914.PNG
• Bottom map by Andrew0921, CC BY-SA 3.0. https://commons.wikimedia.org/wiki/File:British_Empire_in_1914.png

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• Modern History

The four MAIN causes of World War I explained

The First World War was the first conflict that occurred on a staggering scale. World War I (WWI) was unprecedented in its global impact and the extent of its industrialization.

However, the reason why the war originally began is incredibly complex. To try and explain the causes of the war, historians have tried to simplify it down to four main causes.

They create the acronym: MAIN. 

Imperialism

Nationalism.

This simplified acronym is a useful way to remember the four MAIN causes of the war.

However, we will explain each of these concepts out of order below.

One of the most commonly discussed causes of WWI was the system of alliances that existed by 1914, the year the war started.

An 'alliance' is an agreement made between two countries, where each side promises to help the other if required.

Most of the time, this involves military or financial assistance. When an alliance is created, the countries involved are known as 'allies'.

By the dawn of the First World War, most European countries had entered into one or more alliances with other countries.

What made this an important cause of WWI, was that many of these alliances were military in nature: that if one country attacked or was attacked, all of their allies had promised to get involved as well.

This meant, that if just one country attacked another, most of Europe would immediately be at war, as each country jumped in to help out their friends. 

Imperialism, as a concept, has been around for a very long time in human history. Imperialism is the desire to build an empire for your country.

This usually involves invading and taking land owned by someone else and adding it to your empire. 

By the 19th century, many European countries had been involved in imperialism by conquering less advanced nations in Asia, the Americas or Africa.

By 1900, the British Empire was the largest imperial power in the world. It controlled parts of five different continents and owned about a quarter of all land in the world.

France was also a large empire, with control over parts of south-east Asia and Africa.

By 1910, Germany had been trying to build its own empire to rival that of Britain and France and was interested in expanding its colonial holdings.

This meant that when an opportunity for a war of conquest became available, Germany was very keen to take advantage of it.

Militarism is the belief that a country's army and navy (since air forces didn't exist at the start of WWI) were the primary means that nations resolved disagreement between each other.

As a result, countries like to boast about the power of their armed forces.

Some countries spent money improving their land armies, while others spent money on their navies.

Some countries tried to gain the advantage by having the most number of men in their armies, while others focused more on having the most advanced technology in their forces.

Regardless of how they approached it, countries used militarism as a way of gaining an edge on their opponents.

An example of this competition for a military edge can be seen in the race between Britain and Germany to have the most powerful navy.

Britain had recently developed a special ship known as a 'dreadnought’. The Germans were so impressed by this, that they increased their government spending so that they also had some dreadnoughts.

The final of the four causes is 'nationalism'. Nationalism is the idea that people should have a deep love for their country, even to the extent that they are willing to die for it.

Throughout the 19th century, most countries had developed their own form of nationalism, where they encouraged a love of the nation in their citizens through the process of creating national flags and writing national anthems.

Children at schools were taught that their country was the best in the world and that should it ever be threatened, that they should be willing to take up arms to defend it.

The growing nationalist movements created strong animosity between countries that had a history of armed conflict.

A good example of this is the deep anger that existed between Germany and France.

These two countries had a recent history of war and struggling over a small region between the two, called Alsace-Lorraine.

Germany had seized control of it after the Franco-Prussian War in 1871, which the French were deeply upset by.

As a result, France believed that they should be willing to fight and die to take it back.

Conflicts and Crises

In the two decades before WWI started in 1914, there were a number of smaller conflicts and crises that had already threatened to turn into global conflicts.

While these didn't eventually start the global war, it does show the four causes mentioned above and how they interacted in the real world.

The Moroccan Crisis

In 1904, Britain recognized France's sphere of influence over Morocco in North Africa in exchange for France recognizing Britain's sphere of influence in Egypt.

However, the Moroccans had a growing sense of nationalism and wanted their independence.

In 1905, Germany announced that they would support Morocco if they wanted to fight for their freedom.

To avoid war, a conference was held which allowed France to keep Morocco. Then, in 1911, the Germans again argued for Morocco to fight against France.

To again avoid war. Germany received territorial compensation in the French Congo in exchange for recognizing French control over Morocco.

The Bosnian Crisis

In 1908, the nation of Austria-Hungary had been administrating the Turkish regions of Bosnia and Herzegovina since 1878, but they formally annexed it in 1908, which caused the crisis.

The country of Serbia was outraged, because they felt that it should have been given to them. As a result, Serbia threatened to attack Austria-Hungary.

To support them, Russia, who was allied to Serbia, prepared its armed forces. Germany, however, who was allied to Austria-Hungary, also prepared its army and threaten to attack Russia.

Luckily, war was avoided because Russia backed down. However, there was some regional fighting during 1911 and 1912, as Turkey lost control of the region. 

Despite this, Serbia and Austria-Hungary were still angry with each other as they both wanted to expand into these newly liberated countries.

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The Causes and Effects of World War I Essay

Introduction.

The effects of World War I can be seen around the world even now, more than one hundred years after its end; however, there is still no consensus as to its cause. In the words of Alfred Korzybski, “the destruction was brought about by nationalism, entangled alliances, narrow ethnic concerns, and desires for political gain – forces that are still with people today.” (cited in Levinson, 2014). Even though the majority of United States citizens did not have the direct experience of the terrific upset that the war caused in Europe, it can be argued that the country’s concern with championing democracy around the globe is one of its products (Levinson, 2014).

Many historians agree that an atmosphere of twentieth-century Europe was conducive to the creation of a complex mixture of economic, social, and political reasons that translated into powerful forces of imperialistic, nationalistic, and militaristic movements leading to the diplomatic crises of 1914 (Donaldson, 2014). Therefore, it can be said that the blame for the war could not be assigned to any individual country or a group of countries.

Nonetheless, the issue of responsibility was the main focus of the world in the years following the Armistice of 1918 (Donaldson, 2014). To this end, the Commission on the Responsibility of the Authors of the War and the Enforcement of Penalties met in Paris in 1919 (Donaldson, 2014). The investigation conducted by the commission showed that Germany and Austria, along with Turkey and Bulgaria as their allies, were responsible for the aggressive foreign policy tactics that led to the precipitation of the war (Donaldson, 2014).

The start of World War I was precipitated by the assassination of the heir to the Austro-Hungarian throne, Archduke Franz Ferdinand, on June 28, 1914 (Mulligan, 2010) The elimination of the high-standing official was carried out by the group of secret society members called Black Hand and directed by Bosnian Serb Danilo Ilić (Storey, 2009). The political objective of the murder was to separate Austria-Hungary’s South Slav provinces to combine them into Yugoslavia (Storey, 2009).

In response to the killing of their official, Austria-Hungary issued an ultimatum to Serbia that commanded its government to prosecute the assassins. The objective of the ultimatum was to make its terms so strict that Serbia would be forced to reject it, thereby giving an excuse for launching a small war against it (Storey, 2009). Taking into consideration that Serbia had diplomatic relationships with Russia strengthened by their shared Slavic ties, the Austro-Hungarian government decided to take precautions against the two countries declaring war on it and allied with Germany. It is agreed that Germany was not opposed to Austro-Hungarian bellicosity, but rather supported and encouraged it, thus providing one more reason for the precipitation of the Great War (Levinson, 2014).

Even though Serbia’s response to the ultimatum was placating, Austria-Hungary decided to take aggressive action and declare war. It is argued that the main reason for World War I was the web of entangling alliances among the countries having an interest in the conflict between Austro-Hungary and Serbia (Storey, 2009). Following the Austro-Hungarian declaration of war, the Russian monarch mobilized his army because of the binding commitment of the treaty signed by the two countries.

As a result, on August 3, 1914, Germany declared war on the Russian Empire (Levinson, 2014). France was bound by treaty to Russia, and, therefore, had to start a war on Austria-Hungary and Germany. Even though a treaty tying France and Britain was loosely worded, the latter country had “a moral obligation” to defend the former (Levinson, 2014). Therefore, Britain and its allies Australia, Canada, India, New Zealand, Japan, and the Union of South Africa also took a bellicose stance against Germany and offered their assistance in the military action against the country (Levinson, 2014). Thus, a gigantic web of entangling alliances pushed numerous countries to the precipice of war over what was intended to be a small-scale conflict between Austria-Hungary and Serbia.

Numerous other reasons led to World War I. The conflicting political interests of Russia and Japan over Manchuria and Korea resulted in a military defeat of Russia (Levinson, 2014). Therefore, the country wanted to restore its dignity by a victorious war. During the same period, a lot of small nations were seething with discontent over the Turkish and Austro-Hungarian rule, thereby providing an opportunity for the Russian Empire further to stir resentment by firing up nationalistic zeal under a pretense of pan-Slavic narrative (Levinson, 2014).

Austria-Hungary, on the other hand, sought an opportunity to establish its influence over a vast territory of mixed nations; the assassination of the heir to the Austro-Hungarian throne provided them with a perfect excuse for the initiation of the war. Political clashes in Germany were a reason for the country’s government to resort to the military conflict as a way of “averting civil unrest” (Levinson, 2014). Another factor that caused World War I was the desire of France to revenge a military defeat in the Franco-Prussian War of 1871 (Levinson, 2014).

It is impossible to name a single reason for the initiation of World War I. However, it is clear that the entangling web of alliances among numerous parties participating in the war, as well as complicated plots of governments and empires, led the small-scale dispute between Austria-Hungary and Serbia escalating into a military conflict that swept the entire world.

Donaldson, P. (2014). Interpreting the origins of the First World War. Teaching History , 155 (4), 32-33.

Levinson, M. (2014). Ten cautionary GS lessons from World War I. Et Cetera, 71 (1), 41-48.

Mulligan, W. (2010). The origins of the First World War . Cambridge, England: Cambridge University Press.

Storey, W. (2009). The First World War . Lanham, MD: Rowman & Littlefield Publishers.

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What Were The Underlying Causes of World War I

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Published: Feb 9, 2023

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Works Cited

• Bulow, Bernhard von. “Hammer and Anvil.” Speech to the Reichstag. Speech to the Reichstag, 11 Dec. 1899, Berlin.
• Follett, Ken. Fall of Giants. Penguin Group, 2012.
• Joll, James. Origins of the First World War. Routledge, 2018.
• McCutcheon, John. “The Crime of the Ages-Who Did It?” The Chicago Tribune, 1914.
• Ruggenberg, R. (n.d.). Immortal Quotes from the Great War. Retrieved from http://www.greatwar.nl/quotes/immortal33.html
• Thomson, James. Rule Britannia, Great Britain. 

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Causes of World War 1

This essay will examine the causes of World War I. It will explore the complex web of political, military, and cultural factors that led to the outbreak of the war, including nationalism, militarism, alliances, and the assassination of Archduke Franz Ferdinand. PapersOwl showcases more free essays that are examples of Conflicts.

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At the end of the 19th century and the beginning of the 20th century, the world was seething with an explosive, hair-trigger force waiting to explode. Capitalism was undergoing a transition to imperialism. The world’s territory was divided among the world’s most powerful nations. Colonies were scattered throughout Asia, Africa, and Latin America. The struggle between the new empires and the old ones was getting larger and larger.

As new forces began to snatch resources, uneven economic development and inadequate allocation of resources among countries created international pressure and conflict.

It was an era rife with nations enthusiastic about their military status’ and national pride. This perfect combination of pressure led to the beginning of the First World War in July 1914. There were four main causes of WWI — militarism, alliance, imperialism, and nationalism — that escalated into a global conflict. This free essay about the causes of WWI will explore the interconnectedness of these four concepts.

Militarism is when a country develops strong military and advanced technological weapons to pursue its own interests aggressively. This tactic highlights the national status and is a means to protect, expand, and intervene in territorial disputes as needed. During this time, nations raced to create advanced-power weapons and get them into the hands of their soldiers, a competition referred to as an arms race. Nations were investing in the idea that a strong military indicated a strong country, and those with the most progressive technology and efficient troops were perceived as the most powerful adversaries.) Before World War I, the most drastic forced competition was between Great Britain and Germany, respectively, showing their supremacy in military powers. This embrace of militarism, while not unique to these countries, also meant other nations were prepared for warfare.

In the early 20th Century, Great Britain possessed the strongest naval forces of developed nations. The battle-hardened British Navy helped Great Britain conquer a quarter of the world’s landmass. In 1889, the British Parliament passed the “Naval Defense Act,” which effectively doubled the size of the established British navy and established its size as even larger than the next two competing nation’s navy’s combined, with 62 warships of over 5,000 tons possessed by the British Navy, while the Germans had only 12.

Britain saw Germany as a potential military threat and continued to intensify its efforts to develop its military, especially the Navy. This was largely due to Germany’s leader, Kaiser Wilhelm II, who believed that formidable military strength would bring Germany untold prestige and power, firmly planting it as a center of European power. Germany passed the First Fleet Act in 1898, authorizing it to divert time and energy toward the development of a strong, competitive Navy.

Technological advancements followed suit, and Britain acquired new steel battleships, significant upgrades from previous wooden ones. The most imposing style was the steel ship the Dreadnought, equipped with 12-inch guns. Countries immediately aspired to create this new type of fearsome sea weapon. In 1914, Britain was the global leader in naval personnel, with 209,000 soldiers and 29 Dreadnought battleships. Meanwhile, Germany took second place with 79,000 soldiers and 17 Dreadnought ships but ultimately grew to have 38 of the fearsome ships.

Germany set Britain as a military target and then attempted to catch up with it. Germany Kaiser Wilhelm II believed that formidable military strength will bring Germany prestige and power. Meanwhile, Germany will be received respect from other European nations. If Germany could not possess powerful troops and advanced weapons, there would be no place and no discourse power for Germany in many European countries. Wilhelm II’s call boosted the passing of The German First Naval Law in 1898. The law claimed to begin the process of building a powerful navy.

After that, the second law required double the size of the German Navy from 19 battleships to 38. Wilhelm II’s encouragement supported the improvement of naval forces: “Germany is a young and growing empire. She has worldwide commerce, which is rapidly expanding and to which the legitimate ambition of Patriotic Germans refuses to assign any bounds. Germany must have a powerful fleet to protect that commerce and her manifold interests in even the most distant seas. She expects those interests to go on growing, and she must be able to champion them manfully in any quarter of the globe”. Moreover, Germany had the most powerful army, the Prussian army, which defended itself against the French in 1871, and the victory made them the most dangerous and effective military force in Europe. (Cleary)

The national governments of many European nations constantly instilled militarism into people’s minds, regarding leaders as heroes, advocating officers, and glorifying and romanticizing militarism. The nations permeated this idea into every corner. A strong military force could bring them prestige, protection, expansion, and improvement of the economy. Fighting, then, rather than negotiations, seemed to be the most reasonable method for resolving international conflict.

Militarism cannot begin a war alone. In order to succeed, nations need to form alliances. An alliance is an agreement of two or more countries in regard to political, military, or economic cooperation. European countries had many alliances before World War I, though they were often short-lived. Some were due to the emergence of new leaders or the replacement of old alliances with new ones. Some were due to the collapse of the countries or the betrayals between nations. Europe, the melting pot of ethnic and territorial disputes, is a place where change was possible and was happening fast.

One example of these fluid alliances was in 1873 with the Three Emperors’ League. Germany, Russia, and the Austro-Hungarian Empire. Within five years, Russia pulled out of the league to attend to its own national conflicts, and the league officially collapsed in 1878. Germany and Austria-Hungary formed The Dual Alliance in 1879, eventually adding Italy and becoming the Triple Alliance in 1882, allowing all three nations to support one another. In response, the Franco-Russian Alliance emerged, partnering with France and Russia in 1894.

Military alliances usually require signatory nations to support each other when they have wars with other countries, showing up in battle or with financial support, aligning against shared common enemies. Britain, Russia, and France overcame cultural differences and historical tensions to form a new alliance, the Triple Entente, in 1907. Britain was hoping to achieve victory in their arms race against Germany, while France was attempting to recapture provinces that had been previously ceded to Germany, uniting the two nations.

Additionally, Russia was still fighting with Austria-Hungary for control of the Balkan territory. These intertwined conflicts and disputes divided Europe into two major alliances, which lit the fuse of the bomb of World War I that followed. “The alliances created an excessively rigid diplomatic framework, within which relatively small detonators could produce huge explosions,” said A. J. P. Taylor, an English historian who specialized in 19th- and 20th-century European diplomacy. (European History)

The third contributing factor to World War I is Imperialism, loosely defined as using military might and force to overtake or influence other nations.s. Usually, colonies were controlled by the imperial nation or governed by a local puppet government. Military troops stationed locally in aid of maintaining order and suppressing rebellions. Colonization allowed imperial nations to acquire abundant resources, cheap laborers, and advantages of trade or commerce.

Before World War I, Great Britain was the largest and wealthiest dominant imperial power in the world. It possessed a quarter of the global landmass and was called “the empire on which the sun never sets” due to its immense size. Britain had colonies on every continent except Antarctica. The British Empire’s imperialism focused on expanding and maintaining trade. It used the colonies as factories to provide its home country with raw materials and manufactured goods as well as cheap labor. France maintained colonies in what are modern-day Vietnam, Laos, and Cambodia, some islands in the Pacific and Caribbean, small territories in South America, and areas of West Africa and India. German colonies included one province in China, Shandong)New Guinea, Samoa, numerous Pacific islands, and several areas in central and southwest Africa.

Before World War I, as empires grew stronger and larger, the competition between them also became fierce as they clamored for land, power, and money Germany and Italy were two relative newcomers to empire-building. When they first joined this imperial group, they found out much of the world’s land was controlled by their European neighbors. As such, Germany plotted to invade and take control of large swaths of East Africa. Within six years of their imperial outset, Germany controlled much of the region and established the German East Africa Company. However, the British and French Empires reckoned that Germany had threatened their holdings in Eastern Africa, increasing European tensions and conflicts.

The scramble for empire in Africa caused diplomatic incidents. One such conflict happened in Morocco in North-West Africa. Although Morocco was not a colony of France, its location of Morocco led it to be influenced by France’s control. France was trying to expand its rule in Morocco, but the German Kaiser stirred up tensions between France and Morocco by giving a speech that encouraged Moroccan independence. This had angered the French government and sparked wrathful diplomatic actions. When France attempted to suppress a revolt in Morocco, the German troops attacked an armed vessel at the Moroccan port of Agadir. Germany’s provocation almost touched off the war. Another event that made the European situation become unstable and intense. The decline of the Ottoman Empire attracted tensions of other European nations. After several failed wars, the Ottoman Empire almost collapsed. Other empires were eager to gain territory and influence in this dying empire. Austria-Hungary, Russia, Germany, France, and Britain all had colonial and trade interests in this region, leading to increased nationalism as they clamored to gain power.

Nationalism is when a country puts its own interests above all. It inspires citizens’ patriotism and a sense of national honor. Nationalism is the most significant contributor to World War I as it permeates militarism, alliances, and even imperialism. Nationalism is the base that triggers these three reasons. Countries pursued military strength and competed due to this nationalistic belief that they were superior to other neighboring nations. However, Nationalism is not relegated only to the matters of weapons.

Nationalism persuades people that their country is supreme in military, economic, and cultural aspects and is often displayed through music, visual arts, literature, and even theater. In a bid to convince people that their own countries are supreme, literature usually included libel or grand falsified statements to shed their opponents in a negative light.

Nationalism made countries excessively confident and gave them the illusion of military strength. Countries all believed their own military capacity was the best. The British were proud of the country’s naval power and developed economy. The French reckoned that they had solid defenses to block the attack of other nations. In Russia, the emperor believed he and his empire were under divine protection. They had the largest land force, which contained 1.5 million men, and their massive population made the country believe it would defeat other smaller countries easily. Germany’s advantages were shown in its developed advanced military weapons and increasing battleships and U-boats. The Germans believed their Schlieffen Plan would be effective and successful. (Nationalism)

Throughout Europe, great powers were considering an invasion of neighboring nations while also accounting for their own defense and national supremacy. The less powerful nations, who opposed these powers, were hoping to gain independence and freedom. The conflict came to a head in the Balkans of Eastern Europe. The Slavic people, who lived in the Balkan region and some of what is presently Serbia, felt they should have their own country. Serbia held a large Slavic population, but it was controlled and influenced by the Austria-Hungary Empire. Slavic nationalists were outraged by the invasion of Austria-Hungary, especially the annexation of Bosnia and Herzegovina. Young Slavic nationalists joined the “Black Hand ” group to oppose the Austria-Hungary Empire and its presumed heir, Archduke Franz Ferdinand.

The combination of the fuel of independence and nationalism was powerful, and the “Black Hand” group made a drastic decision that would change the direction of international relations forever – they assassinated the heir to the Austria-Hungary throne, Franz Ferdinand. The assassination of Archduke Frank Ferdinand by the Black Hand in Sarajevo directly led to the outbreak of World War I as nations scrambled to support their ally countries and vested interests abroad.

The essay on the causes of World War 1 highlighted that the four causes are closely related. A single reason is not enough to cause a Great War between several nations or between two alliances, though nationalism seems to be the most powerful. However, when these factors come together, they increase the possibility of war. Nationalism played the most important role in this because it led to military competition, land expansion, and cliques.

There were various factors that contributed to Germany’s decision to start WWI, including territorial ambitions, frustration with the Treaty of Versailles, and a belief in their own superiority. Germany sought to expand its empire and viewed itself as deserving of more power and land. Additionally, they presumed they could win the war quickly and simply, further fueling their desire to take action.

The primary causes of World War I were militarism, alliances, and imperialism. Militarism refers to the belief that a powerful military is crucial for a nation’s security. Alliances are pacts between nations to support each other in case of war. Imperialism denotes the desire to extend a nation’s authority and influence by acquiring additional territories.

To write about World War 1 in an essay, one must understand that it was a catastrophic global conflict that caused immense loss of life and lasted over four years. It commenced in 1914 following a chain of events that prompted various nations worldwide to mobilize their forces. Ultimately, the Allied Powers emerged triumphant over the Central Powers in 1918 to end the war.

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Not long after the last world war, the historian William L. Shirer had this to say about the next world war. It “will be launched by suicidal little madmen pressing an electronic button. Such a war will not last long and none will ever follow it. There will be no conquers and no conquests, but only the charred bones of the dead on an uninhabited planet.”

As an investigative journalist, I write about war, weapons, national security and government secrets. I’ve previously written six books about US military and intelligence programmes – at the CIA, The Pentagon, Defense Advanced Research Projects Agency– all designed to prevent, or deter, nuclear world war III . In the course of my work, countless people in the upper echelons of US government have told me, proudly, that they’ve dedicated their lives to making sure the US never has a nuclear war. But what if it did?

“Every capability in the [Department of Defense] is underpinned by the fact that strategic deterrence will hold,” US Strategic Command (STRATCOM), which is responsible for nuclear deterrence, insists publicly. Until the autumn of 2022, this promise was pinned on STRATCOM’s public Twitter feed. But to a private audience at Sandia National Laboratories later that same year, STRATCOM’s Thomas Bussiere admitted the existential danger inherent to deterrence. “Everything unravels itself if those things are not true.”

If deterrence fails – what exactly would that unravelling look like? To write Nuclear War: A scenario , I put this question to scores of former nuclear command and control authorities. To the military and civilian experts who’ve built the weapon systems, been privy to the response plans and been responsible for advising the US president on nuclear counterstrike decisions should they have to be made. What I learned terrified me. Here are just a few of the shocking truths about nuclear war.

The US maintains a nuclear launch policy called Launch on Warning. This means that if a military satellite indicates the nation is under nuclear attack and a second early-warning radar confirms that information, the president launches nuclear missiles in response. Former secretary of defense William Perry told me: “Once we are warned of a nuclear attack, we prepare to launch. This is policy. We do not wait.”

The US president has sole authority to launch nuclear weapons. He asks permission of no one. Not the secretary of defense, not the chairman of the joint chief of staff, not the US Congress. “The authority is inherent in his role as commander in chief,” the Congressional Research Service confirms. The president “does not need the concurrence of either his [or her] military advisors or the US Congress to order the launch of nuclear weapons”.

When the president learns he must respond to a nuclear attack, he has just 6 minutes to do so. Six minutes is an irrational amount of time to “decide whether to release Armageddon”, President Ronald Reagan lamented in his memoirs. “Six minutes to decide how to respond to a blip on a radar scope… How could anyone apply reason at a time like that?” And yet, the president must respond. This is because it takes roughly just 30 minutes for an intercontinental ballistic missile to get from a launch pad in Russia, North Korea or China to any city in the US, and vice versa. Nuclear-armed submarines can cut that launch-to-target time to 10 minutes, or less.

Today, there are nine nuclear powers, with a combined total of more than 12,500 nuclear weapons ready to be used. The US and Russia each have some 1700 nuclear weapons deployed – weapons that can be launched in seconds or minutes after their respective president gives the command. This is what Shirer meant when he said: “Such a war will not last long and none will ever follow it.”

Nuclear war is the only scenario other than an asteroid strike that could end civilisation in a matter of hours. The soot from burning cities and forests will blot out the sun and cause nuclear winter. Agriculture will fail. Some 5 billion people will die. In the words of former Soviet leader Nikita Khrushchev, “the survivors will envy the dead”.

I wrote Nuclear War: A scenario to demonstrate – in appalling, minute-by-minute detail – just how horrifying a nuclear war would be. “Humanity is one misunderstanding, one miscalculation away from nuclear annihilation,” UN secretary-general António Guterres warned the world in 2022. “This is madness. We must reverse course.”

Nuclear War: A Scenario   by Annie Jacobsen, published by Torva (£20.00), is available now. It is the latest pick for the New Scientist Book Club: sign up  here  to read along with our members

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Iran’s Attacks Bring Long Shadow War With Israel Into the Open

The volley of drones and missiles was the first time that Tehran directly attacked Israel from its own territory, one expert said.

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By Cassandra Vinograd

• April 14, 2024

For decades, Israel and Iran have fought a shadow war across the Middle East , trading attacks by land, sea, air and in cyberspace. The barrage of drones and missiles Iran launched at Israel on Saturday — though nearly all were shot down or intercepted — represented a watershed in the conflict.

It was the first time that Iran directly attacked Israel from its own territory, according to Ahron Bregman, a political scientist and expert in Middle East security issues at King’s College in London, who called it a “historic event.”

Iran has largely used foreign proxies such as Lebanon’s Hezbollah militia to strike Israeli interests, while targeted assassinations of Iranian military leaders and nuclear scientists have been a key part of Israel’s strategy. Here is a recent history of the conflict:

August 2019: An Israeli airstrike killed two Iranian-trained militants in Syria, a drone set off a blast near a Hezbollah office in Lebanon and an airstrike in Qaim, Iraq, killed a commander of an Iran-backed Iraqi militia. Israel accused Iran at the time of trying to establish an overland arms-supply line through Iraq and northern Syria to Lebanon, and analysts said the strikes were aimed at stopping Iran and signaling to its proxies that Israel would not tolerate a fleet of smart missiles on its borders.

January 2020: Israel greeted with satisfaction the assassination of Maj. Gen. Qassim Suleimani , the commander of the foreign-facing arm of Iran’s Islamic Revolutionary Guards Corps, in an American drone strike in Baghdad.

Iran hit back by attacking two bases in Iraq that housed American troops with a barrage of missiles, wounding about 100 U.S. military personnel .

2021-22: In July 2021, an oil tanker managed by an Israeli-owned shipping company was attacked off the coast of Oman, killing two crew members, according to the company and three Israeli officials. Two of the officials said that the attack appeared to have been carried out by Iranian drones.

Iran did not explicitly claim or deny responsibility, but a state-owned television channel described the episode as a response to an Israeli strike in Syria.

In November 2021, Israel killed Iran’s top nuclear scientist, Mohsen Fakhrizadeh , and followed up with the assassination of a Revolutionary Guards commander, Col. Sayad Khodayee , in May 2022.

December 2023: After Israel’s bombardment of Gaza began in response to the Oct. 7 Hamas-led assault, Iranian-backed militias stepped up their own attacks . And late last year, Iran accused Israel of killing a high-level military figure, Brig. Gen. Sayyed Razi Mousavi , in a missile strike in Syria.

A senior adviser to the Revolutionary Guards, General Mousavi was described as having been a close associate of General Suleimani and was said to have helped oversee the shipment of arms to Hezbollah. Israel, adopting its customary stance, declined to comment directly on whether it was behind General Mousavi’s death.

January 2024: An explosion in a suburb of Beirut, Lebanon, killed Saleh al-Arouri , a Hamas leader, along with two commanders from that group’s armed wing, the first assassination of a top Hamas official outside the West Bank and Gaza in recent years. Officials from Hamas, Lebanon and the United States ascribed the blast to Israel , which did not publicly confirm involvement.

Hezbollah, which receives major support from Iran, stepped up its assaults on Israel after Mr. al-Arouri’s death. Israel’s military hit back at Hezbollah in Lebanon, killing several of the group’s commanders .

March and April: An Israeli drone strike hit a car in southern Lebanon, killing at least one person. Israel’s military said it had killed the deputy commander of Hezbollah’s rocket and missile unit. Hezbollah acknowledged the death of a man, Ali Abdulhassan Naim, but did not provide further details.

The same day, airstrikes killed soldiers near Aleppo, northern Syria, in what appeared to be one of the heaviest Israeli attacks in the country in years. The strikes killed 36 Syrian soldiers, seven Hezbollah fighters and a Syrian from a pro-Iran militia, according to the Syrian Observatory for Human Rights, a British-based group that tracks Syria’s civil war.

Israel’s military did not claim responsibility. But the country’s defense minister, Yoav Gallant, wrote on social media, “We will pursue Hezbollah every place it operates and we will expand the pressure and the pace of the attacks.”

Three days later, strikes on an Iranian Embassy building in Damascus killed three top Iranian commanders and four officers, an attack Iran blamed on Israel.

Matthew Mpoke Bigg contributed reporting.