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This isn't the only thing that caused ww1 it was also because of a british ship with about 100-200 u.s passengers on it and german u-boats sank it.

If you want to know the question above this is the reason:

Germany tried to allly with mexico in the war, and in return they would help mexico get land back from the u.s including texas, Arizona, New Mexico, ( nevada i am not sure of so just don't put that down)

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Q: Why did the Zimmerman Note cause the US to enter World War 1?
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