In McGirt v. Oklahoma, the Supreme Court has decided that a large section of Oklahoma is part of the Muscogee reservation. Now, the vast majority of the reservation's residents are not tribal members. What will happen to them, in terms of their political representation? Can they vote in local, state, and Federal elections? Will they be counted when determining State and Federal congressional seats?
The "Indian Citizenship Act" and the "Voting rights act" make it clear that native Americans, as well as others living on reservation land, are 1) also citizens of the USA and 2) eligible to vote. And of course I mean they are citizens and eligible unless disqualified in some other way.
So Oklahoma retains its congressional and electoral college representation, and people in Oklahoma can continue to vote, as before.