The Bureau of Indian Affairs was established on March 11, 1824 by John C.Calhoun.
John C. Calhoun
They provide the following services: social services, economic development, law enforcement, administration of tribal counts, assignment of land, water claim settlements, disaster relief, healthcare, and general life improvements.
The BIA is the oldest bureau in the US Department of Interior. They are legally and politically tied to Native Americans, and they have to help Indians in need.
Each tribe has a unique relationship with the United States government based on treaties.
Relationships with government are based on treaties, but many Native American treaties have been broken.
They also patrol Native American lands, and investigate crimes against them.