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What caused the us to join world war 1?

User Klaaspieter
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On April 2, President Wilson asked Congress to declare war against Germany specifically citing Germany's renewed submarine policy as “a war against mankind. It is a war against all nations.” He also spoke about German spying inside the U.S. and the treachery of the Zimmermann Telegram.
User John Szakmeister
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Germanys resumption of submarine attacks and merchant ships in 1917
User Amit Mohanty
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