By that reasoning, everywhere in the world except for a tiny part of Africa has been "settled by migration".

Nevertheless, for thousands of years , on every continent, there have been settled people who had "ancestral lands", unless they were displaced by conquerors, who then became the new settled people and the land became the ancestral land of their descendants, etc.

People have fought invaders trying to displace them from their ancestral lands, forever, and no one ever thought that was "ethnophobia".

The notion that "there is no base population, we're all immigrants" is a very, very modern one, and still only true of a small minority of the world's population. Good luck trying to impose that notion on the rest of the world.