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Suppose, for the purpose of discussion, that someone other than Lincoln was elected TTL (Seward, perhaps?). I've heard that the American population was greatly opposed to the French intervention in Mexico, but couldn't do anything about it because of the Civil War. So, what if the Civil War was averted, and the USA declared war on France (and maybe other members of the invading coalition, i.e. Spain or UK) and then deployed the US army south of the border to defend the Republicans in Mexico. How would this war play out? Would Napoleon back down? If not, how would the naval war go, along with the one on the ground?
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