As I've also repeatedly stated: Exemption from all state and federal taxation,
So they can run a business and pay no taxes or collect no sales tax driving American business owners who have to pay taxes out of business?
Why do you suppose that Europeans can compete under those conditions, but inexplicably the US somehow can't?
Besides, what makes you think that NAs wouldn't/couldn't charge their own sales tax? You really haven't thought this through very thoroughly, have you?
Or does the idea of Native Americans reclaiming their power scare you to death? I think that's what this is all about. Just like when former slave owners were vehemently opposed to former slaves regaining their rights and getting their hands on land and firearms. It was interfering with their "business model".
Everyone's entitled to their own opinions, but not their own facts.