The American Frontier

Im looking for books that deal with the American frontier and the settling of the United States. Ive read Empire of the Summer Moon and just got done reading The Frontiersman by Allan Eckert and these two books have awakened an incredible fascination of that time period. Anything having to do with the native american conflict or native way of life or the settling of native american lands would be very much appreciated. I come to you all completely obsessed.