The Top 5 Causes That Led to World War I (2024)

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. The causes of the war are infinitely more complicated than a simple timeline of events, and they are still debated and discussed to this day.

However, the list below provides an overview of the most frequently cited events that led to war.These include a combination of mutual defense alliances, imperialistic rivalries, the rise of militarism, fervent nationalism, and the immediate catalyst—the assassination of Archduke Franz Ferdinand.

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01

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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, 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.).

Read MoreOrigins of WWI: Germany's Rise and European TensionsBy Kennedy Hickman

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Imperialism

The Top 5 Causes That Led to World War I (3)

Imperialismis when a country increases its power and wealth by bringing additional territories under its 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.

Militarism

The Top 5 Causes That Led to World War I (4)

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. Dreadnoughtwas 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 2 million trained soldiers. Great Britain and Germany both greatly increased their navies during this time. 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.

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Nationalism

The Top 5 Causes That Led to World War I (5)

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 its dominance and power, the war became more complicated and prolonged.

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Immediate Cause: Assassination of Archduke Franz Ferdinand

The Top 5 Causes That Led to World War I (6)

The immediate cause of World War I that made theaforementioned itemscome into play (alliances, imperialism, militarism, and nationalism) was the assassination of Archduke Franz Ferdinandof 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 Principshot 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 of 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 17 million dead and 20 million injured. The face of warfare would never be the same again.

In 1914, British author H.G. Wells published his book "The War That Will End War," discussing the change in warfare and coining the phrase that would eventually become synonymous with World War I.

The Top 5 Causes That Led to World War I (2024)
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