The Three Affiliated Tribes: Mandan, Hidatsa, and Arikara

Long before any European drew a line across this land, the Heart River bend of the Missouri was one of the most cosmopolitan addresses on the continent. The Mandan and Hidatsa had lived in permanent earthlodge villages along the upper Missouri for centuries, farming corn, beans, squash, and sunflowers in the river-bottom bottomlands. They were not nomadic hunters.

They were farmers and traders who attracted people from hundreds of miles away. Lakota, Assiniboine, Crow, and eventually French and British traders all came to the Mandan villages to exchange. The Arikara, who had migrated north from the central plains, eventually settled on the Missouri as well, bringing their own agricultural knowledge and ceremony into the river corridor.

The three nations were distinct, different languages, different ceremonies, different histories, yet they occupied neighboring villages and built overlapping trade networks across generations. When Lewis and Clark arrived in the fall of eighteen oh four, they were not discovering a wilderness. They were checking in as guests at one of the most important trading centers in North America.

Their journals record the names and politics of Mandan chiefs, the layout of the villages, the quality of the corn. Smallpox had already struck once in seventeen eighty-one, devastating the population. It would return in eighteen thirty-seven with catastrophic results, a story covered in the great plains track library.

What matters here is the baseline: a people with deep agricultural science, sophisticated diplomacy, and permanent architecture who shaped the landscape of the Missouri long before statehood. The formal name today is the Mandan, Hidatsa, and Arikara Nation, and the tribal government is headquartered at New Town, on the shore of Lake Sakakawea.