I came across an interesting discussion in the New York Times regarding tribal sovereignty and racial justice recently. The article is based around the on-going issue arising from the Cherokee Nation’s attempt to remove the Freedmen (descendants of black slaves) from the tribe and therefore halt any benefits they were receiving.
The action has provoked much debate, as members of various tribes weigh in on the matter, as do the Freedmen. The discussion can be found at: http://www.nytimes.com/roomfordebate/2011/09/15/tribal-sovereignty-vs-racial-justice
There is also a related article on the issue of race in higher education, in which the question of quotas for ethnicities is raised: