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What would I have to change to make Mexico a match for the United States in the 1900s or 1910s, possibly in a war over the losses of the first Mexican-American War.

EDIT: Im wondering what I could change to make the Mexican economy and military strong enough to make a war with the U.S. an option and have them potentially win. Basically what I'm looking for is a POD to make Mexico a superpower.
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