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Assassination of Archduke Ferdinand and Sopie in Bosnia
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Serbia asks Germany for assistance
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Austria invaded Serbia
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Russia mobilizes to Serbian front
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Germany declares war with Russia
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Germany declares war with France
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Germany invades neutral Belgium, Britain declares war
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Japan declares war in Germany
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Russia declared war on Turkey
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Britain and France declare war on Turkey
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Introduction of weaponized chlorine gas
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Attack on the Lusitania by a German U-Boat
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Italy declares war on Austria-Hungary
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Germany begins unrestricted submarine warfare
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Publication of the Zimmerman Note
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Revolution begins in St. Petersburg, Russia
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End of the Romanov rule in Russia
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Wilson requests that the U.S. delcares war on Germany
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The U.S. enters the Great War
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Russian cease-fire treaty
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Germany surrenders