Question: Which Native American tribe from the Great Plains that was moved to a reservation in southwestern Oklahoma was David E. Williams a member of?

Context articles: Plains Apache
High Plains (United States)
Seminole Nation of Oklahoma
Osage Nation
Hoh Indian Tribe of the Hoh Indian Reservation
Kiowa
Native American languages of Wyoming
David E. Williams
Blackbird (Omaha leader)
Shaumonekusse

The Plains Apache are a small Southern Athabaskan group who traditionally live on the Southern Plains of North America, in close association with the linguistically unrelated Kiowa nation, and today are centered in Southwestern Oklahoma.
 The tribe is federally recognized as the Apache Tribe of Oklahoma.
The High Plains are a subregion of the Great Plains mostly in the Western United States, but also partly in the Midwest states of Nebraska, Kansas, and South Dakota, generally encompassing the western part of the Great Plains before the region reaches the Rocky Mountains.
 The High Plains are located in southeastern Wyoming, southwestern South Dakota, western Nebraska, eastern Colorado, western Kansas, eastern New Mexico, western Oklahoma, and south of the Texas Panhandle.
 The southern region of the Western High Plains ecology region contains the geological formation known as Llano Estacado which can be seen from a short distance or from on satellite maps.
 From east to west, the High Plains rise in elevation from around 1160 ft to over 7800 ft .
The Seminole Nation of Oklahoma is a federally recognized Native American tribe based in the U.S. state of Oklahoma.
 It is the largest of the three federally recognized Seminole governments, which include the Seminole Tribe of Florida and the Miccosukee Tribe of Indians of Florida.
 Its members are descendants of the 3,000 Seminoles who were forcibly removed from Florida to Indian Territory, along with 800 Black Seminoles, after the Second Seminole War.
 The Seminole Nation of Oklahoma is headquartered in Wewoka within Seminole County, Oklahoma.
 Of 18,800 enrolled tribal members, 13,533 live within the state of Oklahoma.
 The tribe began to revive its government in 1936 under the Indian Reorganization Act.
 While its reservation was originally larger, today the tribal jurisdictional area covers Seminole County, Oklahoma, within which it has a variety of properties.
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 16th 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 Hoh or Chalá·at (′Those-Who-Live-on-the-Hoh River′ or ′People of the Hoh River′) are a Native American tribe in western Washington state in the United States.
 The tribe lives on the Pacific Coast of Washington on the Olympic Peninsula.
 The Hoh moved onto the Hoh Indian Reservation, at the mouth of the Hoh River, on the Pacific Coast of Jefferson County, after the signing of the Quinault Treaty on July 1, 1855.
 The reservation has a land area of 1.929 km2 and a 2000 census resident population of 102 persons, 81 of whom were Native Americans.
 It lies about half-way between its nearest outside communities of Forks, to its north, and Queets (on the Quinault Indian Reservation), to its south.
Kiowa ( ) people are a Native American tribe and an indigenous people of the Great Plains.
 They migrated southward from western Montana into the Rocky Mountains in Colorado in the 17th and 18th centuries, and finally into the Southern Plains by the early 19th century.
 In 1867, the Kiowa were moved to a reservation in southwestern Oklahoma.
Wyoming, a state in the western United States that straddles the intersection of the Rocky Mountains and the Great Plains, had been a part of the traditional geographic expanse of various Native American tribes: the Shoshone, the Arapaho, the Cheyenne, and the Crow.
 During the era of Westward Expansion in the late nineteenth and early twentieth centuries, the Crow were pushed north to Montana, where there was already a significant population of their tribe, and the Cheyenne were split between Montana and Oklahoma.
 Only the Shoshone and Arapaho remained in Wyoming, with some of both sent to the Wind River Indian Reservation, and others of both pushed to other western states and Oklahoma, respectively.
 As such, in total, there are two Native American languages currently spoken in Wyoming: Shoshone and Arapaho.
David Williams (native name: Tos-que) (1933–1985) was a famous Native American painter of Kiowa-Tonkawa/Kiowa-Apache heritage from Oklahoma.
 He studied with Dick West at Bacone College and won numerous national awards for his paintings.
 He painted in the flat-style painting technique that was taught at Bacone from the 1940s-1960s.
Chief Blackbird (Wash-ing-guh Sah-ba) (ca. 1750 – 1800) was the leader of the Omaha Native American Indian tribe who commanded the trade routes used by Spanish, French, British and later American traders until the late 18th century.
 He was one of the first of the Plains Indian chiefs to trade with white explorers and also believed to be the first of the Plains Indian chiefs to openly question white encroachment.
 Blackbird used trade as a means to prosperity for his people and as a way to ensure white explorers were aware that they were the guests.
 The Omaha were not warlike people, yet they were the first on the Great Plains to have mastered equestrianism around 1770 and were at one point, while Chief Blackbird was alive, the most powerful Indian tribe in the Great Plains.
Chief Shaumonekusse (Chonmonicase, Letan, L'Letan, "Prairie Wolf") (ca. 1785–1837) was a leader of the Otoe Native American tribe in the early 19th century.
 The Otoe was a Great Plains tribe, closely related to the Ioway and Missouria.