Well, if it's a more believable story to you, I've driven by many reservations that use either "native american", "american indian" or "sioux (or any specific n

Well, if it's a more believable story to you, I've driven by many reservations that use either "native american", "american indian" or "sioux (or any specific name) nation" on the "now entering" signs. There's no consensus term and, as op said, your best bet is not to make assumptions and ask. Rational people aren't offended if you ask them how to be respectful.