AHC: Make Mobile the largest city in the south.

With a POD of 1800, make Mobile, Alabama the largest city in the south with a population at least the size of San Antonio.

Bonus points if this entails making Mobile grow into cities across the border and creates a greater metro with Biloxi with both being very large cities and metros.

I have done this with New Orleans, St.Louis, Detroit and San Francisco, so let's try a new city.
 
Hmmm. Less yellow fever, better port facilities, and maybe a few hurricanes severely damage other Gulf ports like Galveston was. The biggest problem seems to be that their economy was almost entirely slave and cotton based. A more diversified deep south economy is likely the best first step bigger Mobile.
 
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