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Austria-Hungary Archduke Franz Ferdinand and his wife were murdered
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Trench warfare begins as soldiers on both sides dig in
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creating a submarine blockade where even neutral merchant vessels were to be potential targets
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The Germans first use poison gas
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The Battle of Verdun was the longest battle of World War I and was one of the bloodiest
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this was the major naval battle
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Tanks were first introduced
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The Bolsheviks successfully overthrow the Russian government
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This treaty officially ends World War 1