Nation
Three Affiliated Tribes of the Fort Berthold Reservation, North DakotaThree Affiliated Tribes of the Fort Berthold Reservation, North Dakota
Not yet reviewed by this nation. What follows comes from public records and research. It does not speak for the nation.
- Official name
- Three Affiliated Tribes of the Fort Berthold Reservation, North Dakota
- Recorded status
- Listed by the Bureau of Indian Affairs (91 FR 4102, January 30, 2026)
In the record
This nation carries the history of Arikara, Hidatsa and Mandan in the treaty record.
Written from the records linked here; open any of them for its sources. This is what the United States’ treaty record says, not the nation’s own account.
The record over time
Circles are land the United States recorded as ceded, sized by acres and colored by how it was taken. Bars are treaties, broken promises, court cases and land returns.
Land recorded as ceded
This nation carries the history of peoples named in Royce’s schedule. Their record:
- Treaty or agreement11 million
Estimate from Royce’s maps; overlapping cessions counted once. Not a survey or legal measure.
4 cessions. Follow Arikara through the years on the map
- Treaty or agreement11 million
- Act of Congress2 million
Estimate from Royce’s maps; overlapping cessions counted once. Not a survey or legal measure.
6 cessions. Follow Mandan through the years on the map
Who is doing the work
Native legal and land defense, nationally
- Native American Rights Fund (NARF) Native-led Litigation and legal advocacy for tribal sovereignty, treaty rights, land and resources Give on their site Website
- NDN Collective (LANDBACK Campaign) Native-led LANDBACK campaign (launched 2020; Mount Rushmore closure and return of Black Hills public lands), Indigenous… Give on their site Website
- Indian Land Tenure Foundation (ILTF) Native-led Land recovery and control by tribes and individual Indian landowners Website
- Decolonizing Wealth Project (Indigenous Earth Fund; California Tribal Land Return) Native-led Reparative philanthropy Give on their site Website
Gifts go straight to each organization; this atlas takes nothing. Listing is not endorsement: how organizations are listed.
Connections
These links were matched automatically by name or date and have not yet been reviewed by a person.
Land recorded in this nation’s name 7, matched by the Forest Service, under review
- Land of the Arikara, Gros Ventre and others in Montana and North Dakota, ceded 1880 (area 620)1851
- Land of the Arikara, Gros Ventre and others in Montana, North Dakota and Wyoming, ceded 1870 (area 529)1851
- Reservation of the Arapaho, Arikara and others in Montana and North Dakota (area 300)1851
- Reservation of the Arikara, Gros Ventre and others in North Dakota (area 621)1851
- Land of the Gros Ventre and Mandan in North Dakota, ceded 1891 (area 712)1891
- Land of the Gros Ventre and Mandan in North Dakota, recorded 1891 (area 713)1891
- Reservation of the Fort Berthold Reservation in North Dakota (area 716)1892
Carries the treaty history of 3
Sources
- mhanation.com/unclassified
members are currently enrolled in the Mandan, Hidatsa, and Arikara Nation, also known as the Three Affiliated Tribes.
- Indian Entities Recognized by and Eligible To Receive Services From the BIA, 91 FR 4102 (Jan. 30, 2026)primary record
Listed in 91 FR 4102 (Jan. 30, 2026).
- Kind
- Nation
- Confidence
- High
- Nation review
- Not yet reviewed by this nation