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Which events in 1917 helped the United States decide to enter World War I?

User Pluckyglen
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The assassination of Archduke Franz Ferdinand of Austria, and also the Nationalism and militarism.
User Wes Hardaker
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Germany resuming unrestricted submarine warfare is one
The Zimmerman Telegram's interception when Britain said Germany sent Mexico a note to attack us.

User Pinkesh Darji
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