Civil War history is a lot more complicated than is taught. West Virginia broke off from Virginia, the Free State of Franklin was nearly revived in western NC and east TN. The Appalachian region in general had a dim view of slavery and the coastal aristocracies that depended upon it. There were substantial religious communities opposed to slavery in the Piedmont region that practiced a form of conscientious objection to serving in the Confederate military. They sent men, as medical personnel, musicians and pastors, but no soldiers. On the other side of the coin, there were black slaveholders. It’s not a clear cut matter at all, particularly once you get away from the coastal plain and river deltas.
a little stated fact you mentioned, “ there were black slaveholders” is a inconvenient truth (sorry) for those who view the war as a racial liberation only. Choctaws also owned black and Indians of other tribes as slaves. And that is the truth behind Lincoln’s Gettysburg Address, which is unintentional, but a powerful truth just the same. sometimes Lincoln’s beliefs about Africans are brought up, the crust of the matter is still no man should be able to own another. Lincoln had wanted to repatriate Africans back to Africa. powers didn’t want that to happen. Kind of like the immigrant problem today, cheap labor is king.