The cruel ironic fact is that every American with slave blood also has slave holder blood. Reparations would go to the descendants of slavers.
Probably not every one, but almost certainly a majority of American blacks are descended from slaveowners.
I always thought it would have been funny if Alex Haley's Roots had traced his ancestry back to Lincolnshire. He could have gone into the local pub seeking distant relatives.
But nobody else seemed to agree.