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The US wanted to remain neutral in World War 1
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A European passenger ship sank with American passengers on board, helping to prompt the US entry in the war.
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Germany kept attacking US trade ships on their way to deliver goods to Allies. The two countries made the sussex pledge which stated that Germany couldn't sink the trade ships without giving them warning.
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Germany attacked three US trade ships without notice, therefore ending the Sussex Pledge
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The British government intercepted a telegram from Germany, asking Mexico to attack the US and in return they would get southwest US.
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The Germans attacked 3 American trade ships, ending the Sussex Pledge and dragging the US into the War
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President Wilson declared war on Germany after the breaking of the Sussex Pledge..