I have seen this thread on the board lately, Mexico joing the CP, but it always ends with the conclusion that Mexico gets curbstompted by the USA. So, your challenge is to have Mexico join the CP and stand a chance against the USA. POD can be after 1848, but don't go the easy way and balkanize the US. Also, WW1 has to go similiar to OTL, starting in the early 20th century. Go!
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