You gotta understand the Modern Nations are irrelevant. Regardless of the country much of the AAs in the Low Country come from the Mande Ethnic group, and while the tribes in the ethnic group spoke different (but similar) languages, the cultures are the same/very similar. I believe this aided in many groups being able to retain culture that AAs passed down generationally. Also didn't most of the Slave Revolts in America happen in like the Carolinas or something? Like I said before I think although the languages were different the cultures were similar which made it a tad easier for people to eventually communicate and get on code.
In theory Sierra Leone is not a modern nation; although I guess technically it wasn't a nation but a territory before colonialism. The Mane people (Mande tribes) had invaded the region in order to gain access to the sea to support their interior trade routes. The Portuguese wrote about that invasion when they arrived in the region, which was later confirmed and thought to have originated because the Kingdom of Mali had went into decline after the Kingdom of Songhay had arose. For some reason I think that the movement westward for the Mande people had something to do with salt, which could no longer be gotten from inland trade routes due to the Taureg people rebellion in conjunciton with the rise of Songhay. Therefore I think that the Mande people had to fight their way to the Ocean in order to mine ocean salt. At least that is what I think that I remember reading.
Now Liberia is different, but it was also a region that the Mane invaded. The Mande peopel were already in the Ivory Coast and at Kabuu (modern day Guinea-Bissau), which was their furthest military outpost. in teh
Yeah most of people originally taken to Carolina