[skissane]

Native Americans have significantly more rights than, for instance, Indigenous Australians do.

Federally recognised tribes get to run their own elected governments, police forces, court systems, make their own laws, even exempt themselves from provisions of state law in certain cases. Indigenous Australians don’t get any of that

You are right that there are cases in which states or the federal government infringe tribal sovereignty - but at least they have it to begin with. And attempted infringements don’t always succeed - consider the 2020 US Supreme Court case McGirt v Oklahoma, which found that Oklahoma state courts lack criminal jurisdiction (for “major crimes”, which includes murder, manslaughter, rape, arson and burglary) over Native American defendants in the eastern half of the state, such jurisdiction only being possessed by the tribal and federal governments, not the state of Oklahoma.