It is certainly true there were black slaveowners, but I'm sure, as you know, those free blacks were often prisoners in their own states. Law in many Southern states forbade them to even leave the state - unless it was permanent, they were restricted in commerce, legal matters, etc...; just simply living for a free black, even ones who had built up wealth was not as some would have you believe. As the war approached, even more laws were written that could snatch away their "freedom" at any given moment
...and of course, Dred Scott made it clear they were not even citizens of the country they lived in.
Yes, some black slaveowners bought slaves to purchase their kin's freedom, some did it for economic, pragmatic reasons, and some were just as dastardly as their fully white counterparts. All true.
But Grooms inflates numbers by playing with statistics and presenting a much different picture than actually was.
He also fails to mention a good portion of those "negro slaveowners" were mulattoes.
Mary Chestnut wrote about those mulattoes:
"God forgive us, but ours is a monstrous system and wrong and iniquity. Perhaps the rest of the world is as bad—this only I see.
Like the
patriarchs of our old men live all in one house with their wives and their concubines,
and the mulattoes one sees in every family exactly resemble the white children
—and every lady tells you who is the father of all the mulatto children in everybody's household, but those in her own she seems to think drop from the clouds, or pretends so to think."
[Link]
More often than not, those "black slaveowners" many refer to, were by all appearances, quite white.