Actually, Federally-recognized Native American tribes have a government-to-government relationship with the United States and ARE seen as being sovereign nations.
For all the good it does them ...
For all the good it does them ...
Like I stated, so is California and Texas. The Constitution grants only the Federal government the authority to "coin." There is no exemption to Native Americans outside of treaties. If they had a need for their own currency, they would already have it.
Under International Law all indigenous populations have the right to adopt their own currency independent of their host nations (granted most host nations ignore international laws).