I’ll bet that the overwhelming majority of Americans, black AND white, have one or more slaveholders somewhere in their family trees.
And not a soul alive today, black or white, is responsible for any of that.
People can’t change the past, and no one gets to choose who their parents and forebears are.
To take it further, given the prevalence of slavery throughout human history, I'd be willing to bet that there are few, if any people on this planet who are not, in some way, descendants of slaves. Blacks need to just move on. I don't judge people based on their ancestry. Time for them to stop doing so as well. I accept no guilt or responsibility. People who do are fools.