Although the Constitution recognizes state rights, it's concerned mainly with individual rights. But Article I, Sec. 8 also recognizes Indian tribes as distinct entities comparable with foreign nations, and the federal government has signed (and broken) countless treaties with them as if they were separate countries. The Supremes don't often rule on the simplest cases without trashing the Constitution and making fools of themselves. This case isn't simple. Count on the Supremes to screw up in every possible way.