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Archduke Franz Ferdinand and his wife were assassinated while visiting Sarajevo, Bosnia. He was next in line for the Austro-Hungarian throne. The killing set off decades old tensions in Europe and started WWI.
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When Austria-Hungary declared war on Serbia, World War I began.
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The Germans first used gas as a weapon to kill soldiers.
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The Lusitania was a ship that was carrying passengers and the Germans sunk it with a torpedo. It was later found to actually be carrying weapons also.
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Wilsons was reelected for the democratic leader in the election, his slogan was "He kept us out of the war".
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A secret communication in 1917 that said it wanted an alliance between Germany and Mexico before America was in WWI.
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US declared war against Germany after Germany violated the pledge that they will not send any more torpedos to ships after the sinking of the Lusitania.
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Russia's revolution took place and Lenin overthrew the Russian Government.
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War ends between Germany and the United States.
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This treaty ended the state of the war with Germany and the Allied Powers. It was signed in Versalles in 1919.
