The Black Hills, the United States' oldest mountain range, is long and wide stretching across South Dakota and Wyoming. The Black Hills derived its name from the black image that is produced by the thick forest of pine and spruce trees that covers the hills and was given the name by the Native Americans belonging to the Lakota (Sioux). The Lakota Sioux settled the area in about 1765 after being pushed out of Wisconsin and Minnesota by European settlers and Iroquois tribes. The tribe quickly adapted to plains-life, with the bison at the center of their culture.