How and why were whites able to defeat the Plains Indians?

Answer 1

after the lakotan natvies got moved off of their reservations they had a small war and then they signed a treaty so that everyone could be equal

Check out the book Empire of the Summer Moon by S. C. Gwynne, 2010. "Quanah Parker and the Rise and Fall of the Comanches, the Most Powerful Indian Tribe in American History." The Comanches were the ultimate plains Indians. They were central to stopping westward expansion of whites to their plains for over 40 years, it appears, and until repeating firearms were widely adopted a decade after the Civil War and the US Military finally learned how their enemies worked, Comanches were effectively unbeatable. Too often people picture the planes Indians as being father north. Comanches and their surrounding tribes appear to have been the thorniest area of conflict. The northern tribes were largely a different story.

Answer 2

Because thew whites had guns and the Indians did not and because the whites brought diseases to which the Indians had no immunity (it was disease that really defeated the planes Indians).