Federal government policies against Native Americans
Decimation of the Buffalo
Indian Wars: Sand Creek and Little Bighorn
White settlers began to demand access to lands in Indian Territory, and in order to do this, they arranged a new reservations policy known as "concentration". This would assign each tribe its own defined reservation and would be confirmed by separate treaties, which were often illegitimate. Eventually, Congress made two big reservations in the Great Plains for the Native Americans.
White hunters and settlers began to hunt buffalo, which affected the Native Americans' ability to resist their advances. Buffalo played a very big role in the Native Americans' survival.
At Sand Creek, or at the Sand Creek Massacre, the U.S. Army killed peaceful Cheyenne and Arapaho people. At Little Bighorn, the Lakota, Northern Cheyenne, and Arapaho fought against the U.S. Army and were able to secure a victory.