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.
If you can find an American black with the same skin color as one of his kinsmen in Africa then maybe you’ve found someone with no slaveowner blood.