I think if you're going to argue that we shouldn't have contemporary immigration because of the harm to native Americans, then you should show what harm is caused _now_, that native Americans actually oppose immigration, and probably that you support other ways of helping them like giving them land back.

If you go back far enough everyone comes from a line of invaders, so I fail to see how this contributes to anything.

Not a fair comparison.

Immigrants are not killing Americans en masse nor taking the land by force.