...When they could be just as easily called white?
I suppose it could be because being white denotes having a major lack of pigment in your skin, whereas a biracial person still might have a good deal of skin coloration, but that hardly makes them black.
I honestly find such distinctions petty, and I'm from a racially diverse family, but I'd kind of like to know the reasoning behind why biracial persons are considered to be black or Hispanic and not white.
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Because affirmative action.