Is this blue-eyed white man born to two white parents Asian because he was born in Japan? No one in Japan thinks so. And no one in America thinks so, either.
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Japan is a closed off small island that has spent the majority of it's history relatively untouched by outsiders. National, ethnical and racial identity is easier to boil down into just a question of race in Japan because they lack racial and ethnical diversity.
Japan is a bad example when comparing to extremely ethically and racially diverse countries like Africa or brazil, or the us, for instance. Africa is far, far bigger, and more ethnically and racially diverse, thus the definition of what an African is has to also cover a grander scope.
While Japan might not accept the white men who have lived in Japan for a generation or two, many people have come to accept the afrikaners who have been in africa for 300+ years as african, or the white arabs in north africa who have been there for 1,000 plus years as africans.
The same way everyone in brazil can be Brazilian and everyone from the us can be American, not just the indigenous people. It is because ethnically and culturally diverse countries tend to expand their concept of identity beyond just that of race, or at least acknowledge that it is only part of the equation. The dogmatic stubbornness of whittling identity down to nothing but race doesn't work in diverse countries.
A cat born in a stable isn't a horse. Dricus is South African, but he is white/European. A white child born to parents living at a military base in Okinawa isn't Asian.
Another poorly chosen comparison. The concept of different human races isn't comparable to two flat out different species. Also, again, you're working under the faulty assumption that race = identity of a whole diverse continent, when race is only part of it.
That said, this is a dumb discussion. I've talked about it with many africans and they themselves have varying degrees on what it means to be african, probably because they themselves are so diverse, unlike japan....