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Having read Turtledove's TL-191 several time one of interesting aspect of that story is the CSA's purchase of Sonara and Chihauhua.
Lets stretch this. What if as the Peace terms of Mexican US War of 1846-1848, the US gain control of these states from the Mexican Government.
Then 14 years later the US Civil War breaks out. Is the Federal Government able to hold here? Or will these states swing for the CSA as Texas does?
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