Scientists have been able to utilize carbon-dating to evaluate the age of tools found in the area, which indicate a human presence that dates as far back as 11,500 BC with the Clovis culture. Stratigraphic records indicate environmental changes in the land, such as flood and drought patterns.
The Arikara arrived by AD 1500, followed by the Cheyenne, Crow, Kiowa and Pawnee. The Lakota (also known as Sioux) arrived from Minnesota in the 18th century and drove out the other tribes, who moved west. They claimed the land, which they called Ȟe Sápa (Black Mountains). The mountains commonly became known as the Black Hills.
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