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Wilson warned U.S. citizens the danger of taking sides in the war.
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The British ship was hit by a German submarine without warning.
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This was made in agreement that German ships wouldn't fire at U.S ships without warning.
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Germany broke the Pledge by firing at ships with no warning.
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Germany requested a Mexian-German alliance if Germany happen to go to war with the United States.
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Germany hit and sunk 3 American merchant ships.
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The sinking of the U.S, ships was the breaking point for the U.S. and on Apirl 2, U.S. declared war with Germany.