Ham is one of Noah’s sons. He travelled to Africa, becoming forefather of its nations. ‘Children of Ham’ is the Republic’s name for African-Americans. Supposedly, they are being ‘resettled’ in the National Homelands (Midwest).
The term "resettlement" was used by the Nazis as a euphemism for the transportation of Jews and other "undesirables" to the death camps of Poland. The Children of Ham may well face the same fate.