AHC: Chattel slavery and plantations in Mexico

Is it possible to get plantations based around chattel slavery south of the Rio Grande? This can be done either within an independent Mexico, New Spain, annexations to the United States or annexations to British America.

As a secondary question, what crops would be involved?
 
What I heard, the area south of Texas would be suited best. Of course, they're also most similar to Texas / rest-CSA.

If you like and if you dare, you should read a bit of "Decades of Darkness", which has all of Mexico eventually annexed and most of the population enslaved. (The rich Mexicans are assimilated into the *American elites.)
 
What I heard, the area south of Texas would be suited best. Of course, they're also most similar to Texas / rest-CSA.

If you like and if you dare, you should read a bit of "Decades of Darkness", which has all of Mexico eventually annexed and most of the population enslaved. (The rich Mexicans are assimilated into the *American elites.)

South of Texas would be suited best for cotton and other American South style slave plantations, but by that time Mexico is already locked into being free soil.

You need an earlier POD that probably involves sugar and rice plantations in the more tropical areas of Mexico.
 
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