From the Pequot War forward, Alvin Josephy wrote in a 1979 article in The Indian Historian,
Whites gave the Native Americans three options. The first was that they could stop being Indians and turn themselves into Whites. They would have their hair cut, wear White men’s clothes, become Christians, live in White men’s houses, become farmers or mechanics, and adopt the White men’s language, customs, ways of living, values, society, and culture. In other words, they would become assimilated and disappear as Indians. If they refused, they would have to be pushed away, westward to a safe distance, where they would have no contact with White society. They would continue as “wild” Indians, unconquered, but neither a physical or cultural threat to the Whites. If they refused to move or become assimilated, they had a third option: extermination.