The U.S. constitution specifically mentions American Indians three times. Article I, section 2, clause 3 and the fourteenth amendment section 2 address the handling of "Indians not taxed" in the apportionment of the seats of the House of Representatives according to population and in so doing suggest that Indians need not be taxed.
(feel free to post the entire clause)
that was for voting rights the 'tribal' members were given US citizenship in 1924 your point lacks merit
"OUR COUNTRY IS IN MOURNING, A SOLDIER DIED TODAY."