That is all interesting. It is not the reality. On many applications (job, health ins., surveys, school, etc.) the choices are something like this:
White ( European in origin not of Hispanic in origin or any of the groups of Mexico, Central, South America.
Asian( including all groups of Far East in origin)
Hispanic ( from any of the groups in Mexico, Central and South America in origin)
Black ( of African origin)
If there is not the choice, Other, I do not mark anything. I am sure the person who sees me goes on and marks it for me. I always mark the choice Other if it is available. If I am doing something where no one can see me, like an app. on-line, I mark White for the hell of it.
I was just at my doctor's office this week and these were the choices and I left it blank. I am not Black, 100 % , with origins directly in Africa.
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Link, for example-
www.fda.gov/cber/gdlns/racethclin.htm