AHC: South remains agricultural

Your challenge is, with a PoD after the ACW, to have the Deep South remain almost an entirely agricultural economy with little to no industrialization into the 1900s. Bonus points if it can result in tension resurfacing between the Southern and Northern states due to differences in economy.
 
I would llike to edit the challenge-the differences in economy must create a political rift between the Southern and Northern states. How can it be done?
 
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