You are nuts if you think the "millions of acres of soveriegn land" the Indians were left with had any value. They were forced onto that land because the land had no value.
The european settlers (white man) did them no favors letting them setup nation on that land, and it hasnt been until Oil exploration and Casinos that its developed into any kind of value.
I made no claim the land was valuable. As a matter of fact, we (the government of the United States) renigged on more than one treaty to move them from land thought to be valueless to land that actually was valueless, because the first land was found to have value.
Like I said, we didn't always to right by them, not by a long shot. Those European, Asian, and African settlers (mostly European) did them a favor though. In a time when it would have been considered socially acceptable to simply eliminate them, they didn't. In a time when it would have been completely acceptable to just say "you have no more land, get over it", they didn't. They left soveriegn nations, with the full protection and rights of Americans, and virtually none of the responsibilities.
Actually, they offer us a great lesson now. Living in effectively a socialist type society with shared wealth, they have rampant unemployment, 50+% alcoholism, and several other social ills. They give us a good idea of what life would be like in an American socialist environment.