PRB
Member
- Joined
- Nov 4, 2013
- Messages
- 6,006
Japan is a nation-state with official citizenship, like the USA is.
But "black" isn't. In order to be able to say that somebody isn't black, we need to have objective criteria, other than self-identification, that can be used to disqualify them.
There's an objective way to measure ancestry, especially if you're only asking if a person is over 0% or practically indistinguishable from 0%. The cut off point of whether you need 5% or 55% is subjective.