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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 they planned and killed Archduke and his wife.
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The Germans used toxic gas against the Allies. This could blind men and cause death to the people that breath or see the gas. They started using gas mask against that.
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A german U-boat saw the Lusitania and tried to torpedo the ship. The captain ignored the British telegram about a german U- boat and suffered.
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Wilson was reelected in November 1916. He beat Charles Evans Hughes in the election. He pledge neutrality to U.S.
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A man named Zimmermann made a plain to distract the U.S. from the war. This was a telegram that was taken from the British. Then told to the U.S. This drew the U.S. into the war.
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Lenin and his group went and overthrew the government and made governments and agreed with an agreement to end fighting. They wanted to deal with problems at their country.
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Because of all the bad actions that led into americans getting hurt or killed, The government decided to go to war.
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The Allies win the war and beat the Germans. When the Americans entered the war, they set back German lines and made the germans surrender the war.
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This end the war which was the most dangerous war for that time. Germans surrendered to the allied forces. So, the allies won against the central powers.