If you happened to be born into servitude (parent was the slave), it was hereditary. What else are you going to be allowed to do? White's didn't get an allotment when slavery was "emancipated".
There was also a lot of white slavery/servitude after the civil war. Lots of poor orphans who took the place of freed slaves to have food and shelter. They just happened to be invisible.
"There was also a lot of white slavery/servitude after the civil war." Where did this gem come from?