Unfortunately you don't just need empty space for people to live, just ask Australians who are effectively limited to the coast or the east.
England is lucky in that what little land it has is good for humans to live in.
England is lucky in that what little land it has is good for humans to live in.
Colonizers destroyed the way of life of those who lived through a deliberate program of "civilization" (reeducation) which included sending native children to boarding schools to be raised in American culture and "rescued" from their own.
Indian removal [0] is a decent place to start reading.
This was not cultural change via the melting pot, this was genocide and reeducation as state policy, with a generous helping of biological warfare.