Yes, blacks were keen slaveowners. The first documented case of an American suing for the right to own another man for life was that of Anthony Johnson, a black man. He was born in Angola and came to the colony of Virginia as an indentured servant. He worked off his term of servitude then, as he grew wealthy growing tobacco, he began buying slaves of his own. He sued a neighbor for lifetime ownership of a slave named John Casor.
I have been shouting this (on the interwebs) for years. Usually no responses at all.