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As I'm sure most people know, one of the tings that allegedly brought the US into WWI was the Zimmerman Telegram, a German attempt to bring Mexico into the war.

I realize that whether or not Mexico would ever agree to the Telegram is debatable, possibly ASB. However, here's some rabid hand waving action, and voila! The Entente and the US never get wind of the Telegram, and Mexico invades the US ITTL and I guess joins the CP as well. I don't think it's much beyond the scope of feasibility to expect that Mexico gets their arse beaten very badly by the US.

At the end of this WWI, there is a clause in the peace treaty between the Entente and Mexico allowing the US to occupy parts of Mexico to "keep the peace." What happens next? How does the US occupation proceed?
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