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It goes back to the days of the Salem witch trials, during which individuals were sacrificed to fuel our lord satan. The Necronomicon states that that the soul of a white man is worth approximately 40% more than the soul of other skinned men (Tres Quinto Compromise) , as we all know the angels above are white and pure Lamentations 4:7-8.
Witches began to use the white townsfolk for their rituals, but the townsfolk caught on, and began to hunt down the witches that continued that used these sorceries. As a result, the witches began to use individuals of different skin colors (black, brown, yellow, red, blue, green, and the occasional rainbow), but requiring 40% more soul, as their souls were unpure or dirty. As time went on, our lord satan removed the book from this plane, the teachings of the witches disappeared altogether. Their offspring, and their offspring's offspring began to tell tales of these rituals, with their own personal twists.
This brings us to the question above. The whole reason why the term "black" people exists is because anyone who is not white has a less pure, blacker heart. Because of things like the third person effect, and secularization, this term changed from the definition of those with a black heart, to those with black skin.0