The Quapaw (Arkansas and Ugahxpa) people are a tribe of Native Americans that coalesced in what is known as the Midwest and Ohio Valley of the present-day United States. The Dhegiha Siouan-speaking tribe historically migrated from the Ohio Valley area to the west side of the Mississippi River in what is now the state of Arkansas; their name for themselves (or autonym) refers to this migration and to traveling downriver.

The Quapaw are federally recognized as the Quapaw Nation, and is headquartered in Quapaw in Ottawa County, Oklahoma, in the northeast corner of the state.  The Quapaw people elect a tribal council and the tribal chairman, who serves a two-year term. The governing body of the tribe is outlined in the governing resolutions of the tribe, which were voted upon and approved in 1956 to create a written form of government. (Prior to 1956 the Quapaw Tribe operated on a traditional, hereditary chief system).

Resource:  https://en.wikipedia.org/wiki/Quapaw