What states did the Cheyenne live in during 1864?

In 1864, the Cheyenne primarily inhabited areas in the Great Plains, particularly in what are now Colorado, Wyoming, and Montana. They were nomadic, following the buffalo herds, and their territory extended into parts of Nebraska and South Dakota as well. The Cheyenne were involved in conflicts with settlers and the U.S. government during this period, notably culminating in events such as the Sand Creek Massacre in Colorado.