Yes, one of the real sticking points on the 13th Amendment was what to do with all the slaves owned by Indians, primarily Cherokees. The government finally decided to consider them members of the tribes which had owned them.
It's an interesting point that Europeans first tried to enslave the Indians but gave it up because Indians simply refused to be enslaved. They just died in great numbers. So the sugar barons had to look elsewhere and found the tribal kings in Africa more than willing to raid neighboring villages for people to sell. Sometimes they sold their own.
and they sold them to the slavers from the north.
free dixie,sw