[celticmusic]

It's very simple. It's federal land and therefore cannot be taxed by the local governments.

[snagglegaggle]

I'm not totally sold on this interpretation, I've interacted with enough territorial land that I got the impression it is completely left to the tribes. It may technically be "under federal jurisdiction" but if a treaty ceded any or most right to law enforcement then it's independent.

[celticmusic]

Then you disagree with the interpretation of the US Supreme Court, take it up with them.