The Osage Nation (Ni-u-kon-ska, "People of the Middle Waters") is a Midwestern Native American tribe of the Great Plains who historically dominated much of present-day Missouri, Arkansas, Kansas, and Oklahoma. The tribe developed in the Ohio and Mississippi river valleys around 700 BC along with other groups of its language family. They migrated west of the Mississippi after the 17th century due to wars with Iroquois invading the Ohio Valley from New York and Pennsylvania in a search for new hunting grounds. The nations separated at that time, and the Osage settled near the confluence of the Missouri and the Mississippi rivers.
The term "Osage" is a French version of the tribe's name, which can be roughly translated as "warlike". The Osage people refer to themselves in their indigenous Dhegihan Siouan language as Wazhazhe, or "Mid-waters".