A lot of the problem Black people face in trying to trace heredity is that they were here as slaves a couple of hundred years before any real birth records were kept in the States, and many slaves didn’t have the sort of family records that White families may have kept.
A lot of them are interested in where they and their ancestors may actually have come from.
I know you’re right. The tragedy and crime of slavery made black people the only ones who didn’t come willingly to look for a new and better life. No slave traders wanted individuality for the victims by matching names and genealogies.
I don’t remember the movie name (I saw the preview in a theater in probably 1971 or 1972) but it had a black man confidently saying in NYC “Every black person I see go past me I can match their facial looks to their tribe back in Africa.”