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Although the events that lead to such borders might be quite fascinating the final result in a cartographical bore (and it could be worse). Although I do have a TL in mind in which this could happen, I think a challenge is more entertaining.
So what events could possibly lead to the following borders for the United States:
(place more importance in the border with Canada Mexico and the Confederacy than the state division, which do not necessarily need to be the ones proposed Mexico and Canada can also change internally).

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