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Assassination of Franz Ferdinand
Archduke Franz Ferdinand heir to the throne of the Austro-Hungarian Empire, and his wife are assassinated in Sarajevo. -
Austria-Hungary declares war on Serbia.
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Germany declares war on Russia
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Germany declares war on France
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Austria-Hungary declares war on Russia
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German U-boat sinks RMS Lusitania, killing 1,198 civilians
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Battle of Verdun, longest battle, 1 million casualties
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US enter war
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The war ends, Germany and Allies sign Armistice