The Osage, were the largest tribe of the Southern Sioux people occupying what would later become the states of Missouri, Kansas, and Nebraska. Several treaties starting in 1808 between the Osages and the United States resulted in the Osage leaving their tribal lands and to settled in southeast Kansas on the Cherokee Strip.
Later in 1865, in a decision that would eventually make them one of the wealthiest surviving Native American nations, the Osage tribe agreed to abandon their lands again, and move from Missouri and Arkansas to a reservation in Indian Territory in Oklahoma, site of present-day Osage County. More
