Dances with Wolves (1990)

Lt. John Dunbar is dubbed a hero after he accidentally leads Union troops to a victory during the Civil War. He requests a position on the western frontier, but finds it deserted. He soon finds out he is not alone, but meets a wolf he dubs "Two-socks" and a curious Sioux tribe. Dunbar quickly makes friends with the tribe, and discovers a white woman who was raised by the Sioux tribe. He gradually earns the respect of these native people, and they learn from each other and befriend each other.