The cases relating to the Jay Treaty and the laws implementing it for American Indians Born in Canada (INA 289) -which specifically except tribal members by adoption, or any who do not have the required 50% blood quantum - would be tangentially relevant. Since there is a law saying American Indians born in Canada can enter the United States freely, and there is no law allowing an American Indian tribe to naturalize Mexicans for a fee ("Congress shall create a uniform law of naturalization"), it seems highly dubious that their adoptive tribal membership would convey any immigration benefits, absent some specific language in a treaty between that tribe & the United States. Southern border tribes like the OOdham may not even be able to convey United States citizenship to Mexican tribal members by birth, although it is less clear what rights they have to cross back and forth across the U.S.-Mexico border. There does not appear to be a provision comparable to INA 289 for American Indians on the U.S.-Mexico border.