As the Department of the Interior explains, "federally recognized tribes are recognized as possessing certain inherent rights of self-government (i.e., tribal sovereignty)...."[1] The constitution grants to the U.S. Congress the right to interact with tribes.
28 [1913]) warned, "it is not ... that Congress may bring a community or body of people within range of this power by arbitrarily calling them an Indian tribe, but only that in respect of distinctly Indian communities the questions whether, to what extent, and for what time they shall be recognized and dealt with as dependent tribes" (at 46).
[4] Federal tribal recognition grants to tribes the right to self-government, as well as certain benefits.
In January 2015, the United States' Federal Register issued an official list of 566 tribes that are Indian Entities Recognized and Eligible To Receive Services From the United States Bureau of Indian Affairs.
In 2018, six more Virginia-based tribes were added to the list, then in 2020 the Little Shell Chippewa were recognized bringing the total to 574.