Legal status of Indian Reservations and CDA

If I remember correctly, are not American Indian reservations considered qusi-sovergin states under the law? If this is true, what would stop me from negotiating with some tribe to establish an ISP on the reservation and then placing whatever material I wanted on that site without fear of reprisals from the US goverment. After all, if they are a soveign state, decency is covered by whatever laws they have, if any, not the CDA. If this is true, the Indians get the benift of having state-of-the-art telecommunications in thier communities, plus residual job creation, and everyone else gets freedom of speech. Any comments? Regards, Michael Peponis PGP Key Avalible form MIT Key Server,or via finger