I have a feeling that places like Fort Bragg were so named as a gesture of appeasement towards a beaten enemy who had refused not to remain an enemy even when beaten, whom the government in 1918 hoped to make into if not a friend at least not a rancorous unfriend. I don't suppose that the Union was any less racist than the Confederacy: they didn't really go to war to free the slaves, it was a side-effect retro-written as an aim. You'll find it in Wikipedia, but I seriously doubt it was the aim at the time: that war had a lot more to do with (as usual) territory and money. ("It's the economy...")
(Or as Steve Earle put it, "I don't even know what I'm fighting for, I ain't never owned a slave.")