The document discusses several treaties made between Native American tribes and the U.S. government in the 1830s-1860s that ceded tribal homelands. This included the 1851 Fort Laramie Treaty that promised land and supplies but settlers still entered tribal lands. The 1861 Fort Wise Treaty established a poor quality reservation for the Cheyenne. The 1867 Medicine Creek Treaty had multiple tribes agree to give up land for small, insufficient reservations. The 1868 Fort Laramie Treaty changed Sioux territory to include the Black Hills. As a result of these broken treaties and loss of lands and resources, many Native Americans went to war to defend their remaining homelands and way of life.