Which ones? I mean, the Sioux and the Iroquois both ousted tribes before them. I doubt the first claimants for most stretches of land even have descendants.
This. Taking the "stolen land" concept to its logical conclusion results in an impossibility.
But it also embodies the ridiculous idea that the first person to use land has some special moral right to it. Nonsense. No one creates land (conservation of mass/energy, doncha know?) If you plant some seeds, and grow some tomatoes, then it stands to reason that you own the tomatoes, since they wouldn't exist without you. But the land? Get over yourself. Of course,
if (and only if) there is plenty of equally good land nearby, the next farmer should work that land rather than the land you've been using, just to avoid inconveniencing you. But in the real world, that almost never applies.
Property in land, as we know it, has always been based on force and violence. Those who last successfully used violence, or their descendants, right now continue to extort from the rest. If you live on an unattractive bit of land, the amount extracted from you in this way is small. But if you live on a prime spot, like the middle of a large city, most of your rent probably traces directly to the value of the land, not the value of the improvements thereon.
Unfortunately, there is no prospect of changing this in our lifetimes. But the point is, making American Indians the new landlords would not be the solution.