Here's a list of cases where the tribal authorities had to sue the US government, beginning in 1940: https://www.justice.gov/enrd/significant-indian-cases

Failure of the The Government to protect Indians on tribal lands: https://indianlaw.org/safewomen/violation-human-rights

The Government asserts it's sole right to prosecute crimes committed against Indians by non-Indians on reservations: https://www.bia.gov/as-ia/opa/online-press-release/solicitor-says-us-has-criminal-jurisdiction-reservations-where-tribes

State crimes are automatically Federal crimes on reservations: https://www.bia.gov/faqs/do-laws-apply-non-indians-also-apply-indians

A summation of American history with regards to removing the indigenous population: https://www.loc.gov/classroom-materials/immigration/native-american/removing-native-americans-from-their-land/

A US Government Accountability Office report on how the US is currently failing the people it sequestered on reservations: https://www.gao.gov/tribal-and-native-american-issues