What the court said last time is basically “Hey look, our job isn’t to determine whether treaties are good or not. That’s on the legislature. Our job is to say ‘yeah this treaty exists, and needs to be properly legally enforced as a rule of law’ and if you don’t like it you need to resolve that legally through the legislature. Don’t just ignore the treaty.”
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I agree with you, I don’t think that the government would go for it. But saying SCOTUS ruled those lands in Oklahoma to be native is something of a stretch. “The only question before us, however, concerns the statutory definition of “Indian country” as it applies in federal criminal law under the MCA.