Many Native American-owned businesses and organizations are exempt from taxes and regulations.
The IRS code also has a number of exemptions on the federal level in the federal income tax.
Now, ask yourself, why are these exemptions in place? Reparations, perhaps?
Yes. So, it's only fair to give some kind of exemption to descendents of slaves who were deprived of something much more valuable than land.
Ummm... it's not reparations - it's treaties.
You would be wise to leave the American Indian issue out of this, as it is not comparable, nor is it relavent.
Asking why indians who live and work on reservations don't pay state income tax is like asking "How come that guy who lives in another state doesn't have to pay state income taxes in this state...".
Get a clue before spouting off on a topic you appear to know squat about.