that's culture, and ties in with identity. even if you were "FBI", and know nothing of yourself, it's the same thing. same things goes for mixed, what if they know where they come from, are accepted as such in their community, would you call them non-NDN too?
the facts aren't clear-cut. making judgements "just because" isn't productive, you fall in the colonialist game again. i'm quite aware decolonizing yourself is hard, but be aware of your actions, as i will be, and hopefully am, of mine. not trying to poop on what you said, since you, and the other folks here make good points, and bring up always interesting subjects.