The event that triggered World War I in Europe was:

Question

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The assassination of the Austrian archduke Franz Ferdinand by a Serbian nationalist in Sarajevo on June 28, 1914, triggered a chain of events that led to the outbreak of World War I in Europe. Austria-Hungary declared war on Serbia, and other countries, including Russia, Germany, and France, soon became involved in the conflict. Germany's invasion of Belgium was a later event in the war, and Russia's decision to ally with France and Britain was not the initial trigger of the war. The building of Germany's navy and the fallout from the Bolshevik Revolution were contributing factors but not the direct cause of the war.

The Event That Triggered World War I in Europe Was