Nothing! If a superior civilization comes to America and wipes it out and builds a new society in its place, then those people will also be “settlers” not “immigrants.”
I think it’s telling that you have the opinion that a superior civilization would wipe out another at all.
Do you mean the kind of superior civilization that progressed from chattel slavery to being run by a cabal of pedophiles?
Ah, that explains the Israeli "settlers" in Gaza.
I'm worried about your use of "superior" here but yeah the rest of that is right.