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So... Based on a previous post I made, could it be possible for the US-Mexican war to have achieved a different result? Basically, the premise here is that Mexico suceeds in at least defending part of Alta California and maybe some of Nuevo Mexico. Could the US then just instead opt to "liberate" Yucatan and stir the "Rio Grande Republic" to pull another Texas, too?
Both territories, after all, seem perfect for Southron ambitions.