[haihaibye]

It's going to almost impossible to match backgrounds between the two groups and selection effects are huge.

Another question is what are people owed if someone's ancestors were under artificial selection by slavers for many generations?

I think a claim there may be legit. However I'd rather keep objective admissions and hiring and just give cash transfers. I can understand though that people want status as well as cash

[s1artibartfast]

I don't think matching backgrounds is particularly difficult depending on how specific you want to be. Would be pretty simple to do a controlled comparison black people born dirt poor in the US slave ancestry versus immigrant parents.