Final answer:
The assassination of Archduke Franz Ferdinand sparked the beginning of World War l in Europe.
Step-by-step explanation:
The event that sparked the beginning of World War l in Europe was the assassination of Archduke Franz Ferdinand. On June 28, 1914, the Archduke of Austria-Hungary, Franz Ferdinand, was assassinated by a Serbian nationalist in Sarajevo, Bosnia. This incident led to a series of diplomatic conflicts and triggered a chain reaction of alliances, ultimately resulting in the outbreak of the war.
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