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Ok, since I am getting reprimanded for doing doing timelines right, and I going to "bounce around some ideas" and get feedback and do some research. It may take me awhile, but if I wanna get noticed on here, I have to do it right.
The idea:
What if the Zimmerman telegram was successful, and Mexico joins the Central Powers? Does this mean war with the U.S.? If so, what would a Second Mexican-American War be like?