What caused World War I?

Causes of World War I

• Militarism: In the late 1800s and early 1900s, European powers like Germany, Britain, France, and Russia built up massive armies and navies. This arms race increased tensions and made war more likely.
• Alliances: By 1914, Europe was divided into two main alliance systems. One included Germany, Austria-Hungary, and Italy (the Triple Alliance), while the other included France, Russia, and Britain (the Triple Entente). These alliances meant that a conflict involving one country could quickly involve others.
• Imperialism: European countries competed fiercely for colonies and influence, especially in Africa and Asia. This competition led to rivalries and conflicts, particularly between Britain, France, and Germany.
• Nationalism: National pride and ethnic tensions were high, especially in the Balkans. Various ethnic groups sought independence from empires like Austria-Hungary and the Ottoman Empire, leading to instability.
• Assassination of Archduke Franz Ferdinand: On June 28, 1914, the heir to the Austro-Hungarian throne was killed in Sarajevo by Gavrilo Princip, a Bosnian Serb nationalist. This event triggered a series of diplomatic crises.

Sequence of Events Leading to War

1. Austria-Hungary issued an ultimatum to Serbia after the assassination.
2. Serbia's response did not satisfy Austria-Hungary, which declared war on Serbia on July 28, 1914.
3. Russia mobilized to support Serbia.
4. Germany declared war on Russia on August 1, 1914, and on France two days later.
5. Germany invaded Belgium, leading Britain to declare war on Germany on August 4, 1914.

Key Takeaways

• World War I was caused by a mix of militarism, alliances, imperialism, and nationalism.
• The assassination of Archduke Franz Ferdinand was the immediate trigger, but deeper tensions had been building for years.
• The alliance system turned a regional conflict into a global war by August 1914.