There were also black slaveowners in the Civil War.
It doesn't matter because your claim is incorrect anyway. The first case of servitude for life, i.e. slavery, was recorded in 1640.
"Whereas Hugh Gwyn hath . . . brought back from Maryland three servants formerly run away . . . the court doth . . . order [that] the first serve out their times with their master according to their indentures, . . . and that [the] third being a negro named John Punch shall serve his said master or his assigns for the time of his natural life here or elsewhere." A Virginia Court Decision (1640) from Virginia Magazine of History and Biography (January 1898), vol. 5, no. 3, p. 236.
He was an Angolan indentured servant. His name was Antonio/Anthony Johnson of Northhampton County, Virginia.
He served his term of indenture, became a freeman and bought a large acreage of land with money he had saved during his indenture. Not only was he the first recognized owner of a “slave” in the sense of lifetime ownership or chattel slavery, John Casor being the name of that first slave, but he bought and owned his own wife.
Anthony Johnson was far from the only colored freeman on record in Virginia who owned slaves after the advent of chattel slavery, the first legal instance of which is attributed to him. Prior to that, indentured servants from Africa were fairly rare, regarded as exotic and were sought after in Virginia, as there was an element of status involved.
It’s far more complicated and not nearly so black and white an issue as modern polemicists would have us believe.
I think there were a lot of indentured servants that never got their freedom. These were from europe and I believe from the orient...