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Archduke Ferdinand of Austria-Hungary is assassinated by a Serbian.
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Austria-Hungary declares war on Serbia
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Russia mobilizes
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Germany declares war on Russia
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Germany declares war on France
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Britain declares war on Germany
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Austria-Hungary declares war on Russia
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France and Britain declare war on Austria-Hungary
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The United States joins its allies, France, Britain, and Russia in war
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Armistice of WWI
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Treaty of Versailles is signed