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Assassination of Archduke Franz Ferdinand
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"Blank Check"
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Serbian Ultimatum
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Austria declares war on Serbia
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Tsar Nicholas II orders partial mobilization of army
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Full mobilization of the Russian army
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Germany declares war on Russia
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Germany issues ultimatum to Belgium
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Germany declares war for France
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Great Britain declares war on Germany
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Period: to
First Battle of the Marne
The French are able to turn the Germans away for Paris and trench warfare begins on the western front. -
Italy joins the Allies