The Harrisonville area was long inhabited by speakers of the Dhegihan Siouan-language family: The Osage, Quapaw, Omaha, Ponca and Kansa tribes make up this sub-group. The Kansa tribal range extended southward from the Kansas-Missouri River junction as far as the northern edge of present-day Bates County, Missouri, taking in the sites of modern Pleasant Hill, Garden City, Archie and Drexel. On their southeastern border they were neighbors of the Osage. There is no evidence that either of these tribes ever had a truly permanent settlement in the territory of Cass County.