THere were black plantation owners too. Some of the largest owners were black.
As well, there were white slaves (although the left deny this and claim they were nothing but “Indentured servants”, but everyone a.ive when it happened knew full well that they were slaves with nor rights, nor any way to work off their supposed debts). Infact white slaves were much cheaper than black slaves, and as a result many were brutally treated and simply replaced when they died from the abuse.
There were also Indian women, wives of black slaves, on plantations owned by whites. A sizable number of black Americans have at least a little American Indian ancestry.