Agencies of the Bureau of Indian Affairs
In the United States, the office which created and maintained the largest amount of records of the American Indians was the field office of the Bureau of Indian Affairs called the agency. Agencies of the Bureau of Indian Affairs in the United States are administrative offices supervising the relationship between and among American Indians and others. Usually an agency operated on a reservation and was responsible for only that reservation. Occasionally, an agency had responsibility for several groups of Native Americans.