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  The assassination of the Archduke of Austria-Hungary caused the beginning of Word War I
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  On July 28 of 1914 Austria-Hungary declared war on Serbia.
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  The Germans first use gas as a weapon to kill french soldiers.
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  A British ship that was torpedoed by the Germans.
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  Wilson was re elected but was defeated by Charles Even Hughes.
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  The Zimmerman Note was created by Arthur Zimmerman. The Zimmerman Note was a secret diplomatic communication
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  America declaring war is one of the causes of WWI.
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  Bolsheviks seized power and destroyed the tradition of the csarist rule.
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  Germany was now losing the Great Battle in France and the German Navy had gone on strike and refused to carry on fighting.
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  The treaty was negotiated between January and June 1919 in Paris.
