The precipitating event leading to World War I was:

Question

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The assassination of Franz Ferdinand, heir to the Austrian throne, in Sarajevo on June 28, 1914, was the spark that ultimately ignited the powder keg of tensions and alliances in Europe, leading to the outbreak of World War I. The sinking of the Lusitania and Germany's invasion of France were significant events in the war but occurred after it had already begun. The Russian Revolution occurred during the war, but it was not the cause of it.

The Precipitating Event Leading to World War I Was