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The events leading up to World War I.
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Franz Ferdinand, the Archduke and heir to the Austrian-Hungarian throne, and his wife were killed by Serbian terrorists.
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After recieving backing from Germany, Austria Hungary declared war on Serbia.
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Czar Nicholas II commanded full mobilization against Austria Hungary, prompting a German response.
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Following Russia's actions against Austria Hungary, Germany declare's war.
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Following their actions against Russia, Germany declares war on France.
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Claiming Germany violated Belgium neutrality, Britain declared war on Germany.