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"NCAI was established in 1944 in response to the termination and assimilation policies the US government forced upon tribal governments in contradiction of their treaty rights and status as sovereign nations. To this day, protecting these inherent and legal rights remains the primary focus of NCAI."
Tip: You may also want to search for American Indian or Native American Law Centers at universities and law schools, and find out if they've published their own research guides, or are connected with their institutional law library.