This just seems like built in bigotry. Probably going back to the times when tribes captured tribes in battle over land or water or food or whatever and held them as slaves.
There is no 'black race', any more than there is an 'oriental race' or 'white race' or 'any other color race'. Just the Human race. So any implications drawn are incorrect.
Melanin levels in the skin do not determine a race, just an adaptation to the environment by ones ancestors, just like "the epicanthic fold, the skin fold of the upper eyelid, covering the inner corner (medial canthus) of the eye", is thought to be an adaptation to a bright environment (snow covered bright), by people livng in more northern climates long ago. If there different Races we couldn't all breed together, could we. "Modern scholarship regards race as a social construct, that is, a symbolic identity created to establish some cultural meaning. While partially based on physical similarities within groups, race is not an inherent physical or biological quality.", and "race has no taxonomic significance ... all living humans belong to the same species, Homo sapiens, and (as far as applicable) subspecies, Homo sapiens sapiens." (Wikipedia for all references)