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The Archduke Franz Ferdinand assassinated at Sarajevo.
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On July 5, 1914, in Berlin, Kaiser Wilhelm II of Germany pledges his country’s unconditional support for whatever action Austria-Hungary chooses to take in its conflict with Serbia
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Austria-Hungary declares war on Serbia
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Austria-Hungary repeatedly invades Serbia but is repeatedly repulsed
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Germany declared war on Russia
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Germany declared war on France and invaded Belgium
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Britain declares war on Germany
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US President Woodrow Wilson declares policy of US neutrality
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Battle of the Frontiers begins
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Germany declared war on France and invaded Belgium. Germany had to implement the Schlieffen Plan.
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Japan declares war on Germany
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Battle of Tannenberg, which Russia loses; Germany's greatest success of the war on Eastern Front
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Battle of the Marne started.
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First Battle of Ypres
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Unofficial Christmas truce declared by soldiers along the Western Front
