1. Plains Indians Arapaho Blackfeet Crow Kiowa Comanche Northern Cheyenne
Southern Cheyenne
Osage
Sioux
Pawnee
Hidatsa
Mandan
Arikara
Sarcee
Assiniboine
And many more…
Native American: Plains Indians. Map. Encyclopædia Britannica Online. Web. 15 Aug

2. Indian Wars
Total number of Indian information from Native Americans in the Census, 1860–1890 By James P. Collins.
Indian Wars Map from Wikipedia.
Total number of Indian information from Native Americans in the Census, 1860–1890 By James P. Collins.
Indian Wars Map from Wikipedia.

3. The Merriam Report (1928)

4. Notable Politics (timeline)
; Lewis and Clark expedition encounters Native Americans
1814; Andrew Jackson crushes Creek resistance in south
1824; John C. Calhoun creates an Office of Indian Affairs
1830; Indian Removal Act moves eastern Indians west of Mississippi
1834; Congress establishes Indian Department within the Department of War
1838; Cherokee “Trail of Tears”
; plains Indians cede land in exchange for reservations
1854; Upper half of Indian territory becomes part of Kansas Territory
1864; Cheyenne and Arapaho families massacred at Sand Creek, Colorado
; Navaho long walk
; 200 pitched battles between Indians and US Calvary
; Red River War
1876; Sioux and Cheyenne defeat Custer at Little Big Horn, Montana
1877 Nez Perce leave Idaho for Canada
; Northern Cheyenne escape Indian territory
1886; Geronimo (Apache) surrenders after 15-years
1887; Dawes Severalty Act creates allotment system
1889; Ghost Dance
1890; Massacre at Wounded Knee, South Dakota
1892; Five civilized tribes granted US citizenship
1907; Indian territory becomes eastern half of Oklahoma
1924; citizenship Act makes Indians citizens without impairing status as tribal members; Bureau of Indian Affairs formed
1933; Bureau of Indian Affairs reformed; sales of Indian lands halted
Dr Donald R. Sutherland, Bureau of Indian Affairs