I dont like the term "white" but couldn't think of another way of saying what I mean. "Europeans" doesn't really work, because the conquest of much of America's 'wild west' took place after the USA became independent.
Basically, from the Native American Indians' point of view, when did the complete conquest of America by "the white man" become inevitable? Did the Apache, Navajo, Sioux, Cherokee and other native peoples ever have a chance? And when did their conquest by the invaders from the old world become unavoidable?
What year do you think was the turning point?