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Serbia killed the Archduke of Austria-Hungary. This began the war.
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The Emperor of Austria-Hungary declared war on Serbia.
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Germany mobilizes her armed forces and declares war on Russia.
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Germany declares war on France.
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heavy casualties inflicted
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the Bolsheviks agreed to the Treaty of brest-Litovsk, by which Russia yeilded Finland, Poland, the Baltic States, the Ukraine, and Georgian territory in the Trancaucasus.
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end of the war