Everything you need to understand or teach Centennial by James A. Michener.
The story begins with Dr. Lewis Vernor, a professor at a "small college in Georgia" being called on to verify facts of a story written by Carol Endermann. The story then shifts to extensive descriptions of the land, mostly along the South Platte River, and the Colorado town of Centennial, including how the mountain ranges and plains came into being. There are then descriptions of the earliest animals of the region.
Next comes the story of Lame Beaver, a member of the tribe known as "Our People" who will later be called Arapaho and Cheyenne. Lame Beaver encounters a pair of traders, Pasquinel and McKeag, and is impressed with Pasquinel. He tells his young daughter that she should consider marriage to the trapper. Lame Beaver, meanwhile, travels to a place called Blue Valley in search of tipi poles and kills an Indian, retrieving his gun and two bullets...
Centennial Lesson Plans contain 109 pages of teaching material, including: