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The Archduke was assassinated by a Serbian man of a group called the "Black Hand" in order to spark a rebellion.
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All of Europe's power house countries declared war on eachother, creating two alliances.
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In this battle the German's first use poison gas.
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Germans sink a passenger liner with over 1,100 people aboard. 128 Americans.
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This was the first time tanks were ever used in battle, by the British.
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The longest and one of the bloodiest battles of WWI.
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Germany sends Mexico a telegram saying that it would be beneficial for Mexico to join Germany in case of the U.S. entering the war, promising "lost provinces."
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U.S. declared war on Germany.
MoreInfo On The Declarations of War -
Germans make peace with the new Russian government.
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After 5 years of fighting, the treaty ended the fighting between Germany and the Allied Powers.
More info on the Treaty