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Francis Ferdinand assassinated at Sarajevo
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Austria declared war on Serbia
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Germany begins a war with Russia
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Germany's forces invade Belgium
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France and Germany go to war
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The U.k. enters WW1
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Austria- Hungary and Russia go to war
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France and U.K. go to war with Austria- Hungary
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Passenger ship Lusitania is sunk by German U-boats with passengers on board
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Zimmerman telegram is sent to Mexico
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The U.S. enters WW1
