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The assassination of the Archduke of Austria caused the event od World War I.
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The assassination of the Archduke caused war being called on Serbia.
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This gas feared many soldiers. This was so harmful the soldiers have to wear special gas masks.
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The sinking of Lusitania killed many people.
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Wilson being reelected called for him to make big decisions.
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The Zimmermann Note was also a reason for war.
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U.S. was now in the war.
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The Bolsheviks wanted to overthrow the Russian Government.
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No more war made many families happy to see there members back at home.
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The Treaty of Versailles helped end war.