> I believe that technically the Indian reservations are sovereigh nations ...
They are. Which means... the US *could* set up borders around them... gotta have your passport ready to go in and out, say. There is, I believe, nothing wrong with this; it would be an effective card to play if a particular sovereign rez started getting out of hand. If you drove all the way to the rez for a gallon of milk, a pack of smokes or a game of blackjack and you didn't have your passport, you don't get in, and the rez doesn't get your money.
This sort of tactic should be used sparingly but strategically. Whether a state governemnt could set up roadbloack, border crossings and checkpoints, I kinda doubt... but it might be interestign to look into.
It's been done by several states in the North East......New York comes to mind. IIRC, it was more about stopping non-American Indians after they left the Indian smokeshops.....in order to collect the NYS sales and excise taxes on the smokes.
Actually the opposite has almost happened. In NY interstate 81 runs right through an Indian Reservation and whenever Pataki threatens to harass them the Indians threaten to do just that plus put a toll booth up.