Siouan languages
Siouan or Siouan–Catawban is a language family of North America that is located primarily in the Great Plains, Ohio and Mississippi valleys and southeastern North America with a few other languages in the east.
Sioux City, Iowa
Iowa is in the tallgrass prairie of the North American Great Plains, historically inhabited by speakers of Siouan languages.
The area of Sioux City was inhabited by Yankton Sioux when it was first reached by Spanish and French furtrappers in the 18th century. The first documented US citizens to record their travels through this area were Meriwether Lewis and William Clark during the summer of 1804. Sergeant Charles Floyd, a member of the Lewis and Clark Expedition, died here on August 20, 1804, the only death during the two and a half-year expedition.