Just remember, natives the world over "owned" their land too... until they didn't.
If they can prove any theft they should have their land returned to them as well as paid restitution.
Well of course they
should, but without any powerful government to back them up it's a lost cause. The only think keeping me from taking your land right now is the fact that the US government is guaranteeing your ownership of it and the US government happens to have more firepower than I do.