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The assassination of the Archduke instigated the beginning of World War I
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Austria-Hungary declares war on Serbia because the Arch Duke Franz Ferdinand was assassinated by a Serb.
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The Germans used this gas to blind and move soldiers from the trenches causing them to be a very easy target to hit.
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The sinking of the Lusitania furiated the president. It killed 128 americans. He then realized it was carrying war supplies.
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He said that America would be neutral throughout the fighting.
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The group started a revolution to overthrow the Russian goverment
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This was a note that was sent to Mexico. During the send, the British intercepted it and told president Wilson. This made the U.S want to go into the war.
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On April 1917, the United States joined the allied powers in WWI
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On November 11, 1918 the first ever world war ended.
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This treaty brought peace to the World