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Assassination of Archduke Franz Ferdinand by Gavrilo Princip
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WWI started because the Austrian-Hungarian war declaration in Serbia
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Period: to
World War One
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Russia joined the war declaring war to Austria-Hungary, in defense of Serbia
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Germany joined the WWI declaring war to Russia, France and Belgium
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The Ottoman Empire (Turkey) joined the war
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Christmas Truce
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Italy joined the war in the side of the Entente
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United States declared war to Germany
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Russian revolution of the Soviet Union and Russia left the war
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The WWI ended in an armistice
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The Treaty of Versailles