The natives rightly attempted to fight off the Europeans. They lost.
It does not follow that the Europeans here now should just let in whoever wants to come in, to the point that the Europeans themselves are outnumbered.
If the Europeans fight and the newcomers win, so be it. But why should the Europeans lay down and let it happen? Especially when they trivially have the ability to stop it, unlike the natives. For now, anyway…
And your lesson from this is that Native Americans should continue to be ignored and more immigrants let in?
If you care about Native Americans (and don't just use them as a rhetorical device to argue with people on the internet) then surely, you'd support a reduction in immigration, right?
No, that is just the conclusion you want to make. Stop putting in my mouth the words I didn't say.