Virtually everyone in America has slave-holding ancestors.
That includes black Americans.
That’s a fact that should be realized. What’s also important is that this is generations in the past, it’s not like a person owns slaves now. Do people really want to get irrational enough to blame someone for what happened to their however many greats grandparents? Get a life, and move on.
It was probably PBS that did this with Derek Jeter. They figured out that one of his ancestors was a black slave that had been given a plot of land on the plantation and quite a bit of money upon being freed. That was unusual.
They surmised that the landowner had a boy with a slave woman and had provided for the child. Many times it was rape, but other times there was actual love. Jeter figured (hoped?) it was the later, seeing how the landowner provided so well for the young man.
Blood tests confirmed the speculation.
Not really. MANY immigrant waves came after the civil war. And many before that went to states that never had slavery, like the germans and the midwest.