OP I have a couple of points that I would make.
Anytime people discuss Liberia I think that Sierra Leone also has to be discussed, because many African Americans settled there as well after the American Revolution ended when the British resettled the African Americans that fought with the English. Many Africans that don't have roots in Sierra Leone and Liberia don't seem to understand that African Americans actually have history in those two countries.
The second point that I would make is that Liberia and Sierra Leone and the regions around those areas are major places of embarkation for African Americans ancestors that were enslaved. African Americans that take Ancestry DNA and get a high score on Ivory Coast/Ghana are almost certainly descended from the Mande people (Mandingos, Mende, Susu, Vai, Loko, Kpelle, etc.) in and around Guinea, Sierra Leone, Liberia and Ivory Coast. So African Americans with roots in South Carolina, North Carolina and Georgia are almost certainly going to be genetically connected to the people around Liberia, Sierra Leone, Guinea and Ivory Coast.