Answer :
Final answer:
The assassination of Archduke Franz Ferdinand took place on the Balkan Peninsula.
Explanation:
The event that triggered the start of the First World War took place on the Balkan Peninsula. On June 28, 1914, Gavrilo Princip, a young Serbian nationalist, assassinated Archduke Franz Ferdinand of Austria and his wife Sophie in Sarajevo, the capital of Bosnia and Herzegovina. This event set off a chain reaction of diplomatic and military alliances that eventually led to the outbreak of war.
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