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The point of divergence for this is that in 1844, James K Polk is not elected President of the United States. Instead, Henry Clay wins the presidency and as a result, Texas is not allowed to join the Union. This butterflies away the Mexican-American War.

Texas spends the next sixteen years hanging on by a thread. There is trade with Texas, but it is not enough to stop Texas from falling into poverty.

When the Confederate States forms in 1860, Texas applies to join the Confederacy. Unlike the US sixteen years before, the CSA welcomes Texas with open arms as a slave state.

But, there is a problem with this. Mexico never fully recognized Texan independence and it would not tolerate their land being swallowed by a foreign country. Mexico decides to go war against the CSA at the same time as the Union.

So, what if Mexico became involved in the American Civil War?
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