The US is a republic, which puts Indian nations on the level of the 50 states. Like the states Indian nations receive federal funds.
By the way,reservations are not countries, they are prisoner of war camps.
Indeed many of them were just that, but not all.Today Indians are not forced to live on them and they are now places for Indians to use for themselves. On them are now Indian schools, resorts, golf courses, Casinos and Indian run businesses.
Not to say all is perfect or that the US must be watched and demands made on them, but we were never one nation, one people or one language and we do have lands apportioned for us. So I am not sure what exactly you are invisioning and how you think it will work to the many Indian tribes and nations.
Interesting that you equate Indians to the Jews that were chased from their homeland.