That idea, of the Confederates developing White slavery, sparks my interest. I might, and if the AlternateHistory.com people were more accommodating, would, like, to write an alternate history story wherein some semi-apocalyptic catastrophe strikes the North during the Civil War and the Confederates therefore win. It is probably some sort of strange plague bacteria that only multiplies and spreads in below-freezing temperatures. Whatever the disease is, it is limited to colder climes and therefore plunges Northern society into a new dark age, varying from rough feudalism to savagery.
The result of this is to vindicate and greatly strengthen preexisting theories dividing, classifying, and ranking the “White” races, the “traditionless and homeless”, “Celtic” Northern and Appalachian races being judged inferior to the Southern “Norman” race on the grounds of their descent into barbarism. This leads to George Fitzhugh’s proposition of White slavery being adopted, and certain of the “Lesser White Races” enslaved.
Eventually Southern slavery develops into a system similar to the Islamic one, where Whites are kidnapped in raids and enslaved to serve as house slaves and concubines, with the ability for them or their children to win their freedom and assimilate into their conqueror’s society, while the blacks are more oppressed to work as menial labor.
I don’t even know than that’s more implausible than the development of radicalized chattel slavery in the Virginia colony; as late as their 1705 indentured servant and slave law, though there’s some racism in there, they seem to have been defining slaves more as barbarous heathens than according to race as we understand it now.
Where this story ends, I don’t quite know yet, but I find the idea of quasi-medieval Islamic Confederates exploring a 19th century post apocalypse very compelling. (Probably the date is more turn of the century, after a later Civil War that gave the South more chance to radicalize). I have visions of Southrons in the ruins of London, circa 1940, trading with barbarians for captured slaves like the Vikings and Arabs did a millennia before.