Communism

cool surface-level confidence. you might want to consider reading a single supreme court decision for the last few decades. congress has plenary power over tribes -- meaning that congress can abolish tribal courts, override tribal verdicts, or sell tribal land without consent whenever it feels like it.

there's also lone wolf v. hitchcock; used last year in castro-huerta where the supreme court ruled that states can prosecute crimes by non-indigenous against indigenous on reservations -- overriding tribal jurisdiction. not to mention that the major crimes act of 1885 stripped tribes of prosecuting felonies like murder. there's also public law 280 imposed state jurisdiction on reservations in six states without a single tribal vote.

so no, tribal legal systems aren't "not easily infringed on." they exist at congress's pleasure. the only difference between the us and china here is that the us has better pr.