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Which event led to World War I? The Russian czar declared war on Germany. France and Germany went to war over colonial lands in Africa. A German spy was caught in France. A Serbian nationalist assassinated the Austrian archduke.

User Dasar
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A Serbian nationalist assassinated the Austrian archduke.
User David Namenyi
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The last one, D. A Serbian nationalist had assassinated Archduke Franz Ferdinand, sparking World War I to start.
User Misaz
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