I know I will take a lot of heat for saying this here in The South.
Slavery is something that has existed for at least 2000 plus years. Agriculture is supported by it, manufacturing is supported by it and it is no coincidence that the clothes you wear are made by it. Fact is we as humans may not love slavery but it exists because plantations want to make profits, it provides cheap labor to plantations that would otherwise need to charge a ton of money for all that cotton you love. The Southern economy entirely depends on it.
As more and more production including agriculture and manufacturing move to The South do you really truly believe they will remain slave free? Who would toil out in the blazing sun picking cotton by hand, for no pay, to be housed, fed and treated like livestock? Where would the thriving plantation, factory or farm get its labor from? Purely from the free population who buy its products? Do you think we can go back to the ways of charging $90 dollars for a cotton blouse?
Fact is things require labor to make and plantations and factories need humans to labor to keep making things. Slavery whether you like it or not is here to stay.
Edit: What this guy writes is crazy: https://news.ycombinator.com/item?id=10047706