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This was the U.S's way of saying they wanted to remain neutral
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The Lusitania was sunk by a German U-Boat
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This was a pledge by Germany that they would stop sinking U.S. ships...Ultimately this pledge was broken
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Germany sent the Zimmermann Note to Mexico but Great Britain intercepted it and told the U.S. the note told Mexico that is they attacked the U.S. then Germany would give them some of land
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The U.S. was no longer neutral and declared war on Central powers