Answer:
German U-boats kept attacking American boats which caused the U.S to have hostility towards the Central powers. The Allies also owed them money so it would be more beneficial to aid them to win the war so that they could pat back their debt.
1. Germany resumed unrestricted submarine warfare
2. The Zimmermann Telegram revealed a German attempt to gain Mexico as an ally against the United States
3. Renewed attacks on American shipping
Step-by-step explanation:
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