...from long articles about the Civil War:

"The 1860 census counted 240,747 "free Negroes" in the slave states, 15,000 more than lived in the free states to the north."

There were at last 5000 black families in the slave states who owned black slaves.

"...black Americans marched to war with the Southern armies from the very beginning in early 1861. In contrast, the Federal government refused to allow black men to serve in its ranks until well into the conflict. It was 1863 before the North began using black troops in any large number, and only then after considerable opposition."

{for what that's worth}