Khazadman, the Indian lands, IIRC, are on federal land that is designated Indian country and is governed by the treaties between the USA and the Indian nations. It's more complex than just "federal land." It is truly a set of sovereign nations within the US sovereign nation. Now, I think federal law enforcement officers, including tribal officers, are the only officers having jurisdiction on Indian lands.
Casinos do bring jobs to Indian lands. A casino is a large employer. Monetarily, it benefits the Indian community better than anything else has.
Property tax and sales tax don't apply -- as these are state taxes. So, even if national taxes did apply on Indian lands, the state ones WON'T.
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