Black and white are not races. They are racial discrimination categories. People with black skin are not one identifiable group except "black skin". Which is a heritable trait that affects pigmentation used to create a social discrimination category. It does not make a single meaningfully identifiable group in any other sense. (It's not even consistently the same trait, on a biological level)

You are talking about sociopolitical race discrimination and suggesting it has absolute, immutable biological mappings. It does not. This actually is quite close to real racism.