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The area is sometimes called the Lower Plains, North Central Plains,or Rolling Plains. [2] The Osage Plains, covering west-central Missouri , the southeastern third of Kansas , most of central Oklahoma , and extending into north-central Texas , is the southernmost of three tallgrass prairie physiographic areas.
The Osage wrote a constitution in 1881, modeling some parts of it after the United States Constitution. [45] By the start of the 20th century, the federal government and progressives were continuing to press for Native American assimilation , believing this was the best policy for them.
The system dates to Nevin Fenneman's report Physiographic Divisions of the United States, published in 1916. [2] [3] The map was updated and republished by the Association of American Geographers in 1928. [4] The map was adopted by the United States Geological Survey by publication in 1946. [5]
The Osage Agency was established in 1872 at Deep Ford, later renamed as Pawhuska. It was designated as the county seat when Oklahoma was admitted as a state. The other chief settlements in the 1870s were Hominy and Fairfax; each of the three was settled by a major Osage band. [4] In 1875, the US designated their land as the Osage Reservation.
The Dissected Till Plains portion of the northern plains region lies in the portion of the state north of the Missouri River, while the Osage plains portion extends into the southwestern portion of the state bordering the Ozark Plateau. Thus the northern plains covers an area slightly more than a third of the state.
In 1803, most of the land for modern day Kansas was acquired by the United States from France as part of the 828,000 square mile Louisiana Purchase for 2.83 cents per acre. In 1854, the Kansas Territory was organized, then in 1861 Kansas became the 34th U.S. state. In 1859, Osage County was established.
The United States Environmental Protection Agency and the World Wildlife Fund have designated the Flint Hills as an ecoregion, distinct from other grasslands of the Great Plains. [5] [6] Four tallgrass prairie preserves are located in the Flint Hills.
The Osage River is a 276-mile-long (444 km) [2] tributary of the Missouri River in central Missouri in the United States. The eighth-largest river in the state, it drains a mostly rural area of 15,300 square miles (40,000 km 2 ).