Do you all think it's at all plausible if, perhaps due to America securing itself some African allies early on, slavery never gains a racial component? I have vague ideas of America allying with the Barbary pirates to harrass (French?) shipping, instead of warring with them, but this probably requires a rather earlier POD than that. The end goal, of course, is to have black and white serfs and slaves rising up together to overthrow the Southern aristocracy and establish a workers' and farmers' republic.