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Some of the factors that changed this were the Zimmerman note being sent from Germany to Mexico saying Germany would help Mexico attack the US. Also German U-Boats shot at and sank The Lusitania, a cruise ship carrying hundreds of innocent American women, men, and children. The US felt this had to stop.

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12y ago
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Q: What changed the US policy of isolationism and brought the US into World War 2?
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