In a lot of timelines in which there is an independent American south the POD is the CSA winning the civil war, but I have an idea for which I would like to know the plausibility and implications of. What if after the American revolutionary war due to the enlightenment principles of all men being created equal and an earlier abolitionist fervor the southern colonies of Maryland, Virginia, the Carolinas, and Georgia split from the north and two different governments were formed one southern one northern so as the two sections of the United States are separate from the start? Given the differing cultures of north and south how would their governments and institutions differ from the beginning? How would the expansion west work out? What would the world be like today?