All slaves were freed in the state of New York by 1827.
The biggest slave owner in the state of SC was a black man.
There were black slave owners in South Carolina, but the largest black slave owner, William Ellison, did not own more slaves the largest white slave owners.
You are right, but only 1% of Southern slaveowners owned more slaves than William Ellison.
“Ellison raised mostly cotton, with a small acreage set aside for cultivating foodstuffs to feed his family and slaves. In 1840 he owned 30 slaves, and by 1860 he owned 63. His sons, who lived in homes on the property, owned an additional nine slaves. They were trained as gin makers by their father (8). They had spent time in Canada, where many wealthy American Negroes of the period sent their children for advanced formal education. Ellison’s sons and daughters married mulattos from Charleston, bringing them to the Ellison plantation to live.
In 1860 Ellison greatly underestimated his worth to tax assessors at $65,000. Even using this falsely stated figure, this man who had been a slave 44 years earlier had achieved great financial success. His wealth outdistanced 90 percent of his white neighbors in Sumter District. In the entire state, only five percent owned as much real estate as Ellison. His wealth was 15 times greater than that of the state’s average for whites. And Ellison owned more slaves than 99 percent of the South’s slaveholders”
http://americancivilwar.com/authors/black_slaveowners.htm
By the 1830s, many of the 'black' slave owners were previously freed slaves who became prosperous enough to 'purchase' family members. But with changes in the laws in those Deep-south states, they were no longer allowed to free them. Therefor, they remained classified as slaves albeit owned by freed blacks.
I seriously doubt they were lashed for every transgression or their wives were raped on demand or their children were sold at auction when ever 'Master' damn well felt like it.
It is such hypocrisy that the Lost Cause zealots can somehow defend human slavery by constantly screaming that 'blacks owned slaves' too. So what's their point? Maybe 1/100 of 1%. That somehow makes it all better?
That is no justification for slavery, and a perverse twisting of the majority of the experience of black slave ownership which was overwhelmingly acts of compassion and family unity.