“Tribes can actually be a domestic nation that can exercise the necessary government authority over all the people in their territory. But in order to do that, they have to liberalize their membership criteria.”
“Most nations around the world adopt membership rules and criteria without regard to race and ancestry, and Indian nations should do the same,” he says. “For tribes to progress into self-serving, independent nations within a larger nation, they will need to find a way to include non-Indians in the political process of the tribal government while still maintaining a distinctive tribal character.”
For more on the subject, see Defining Tribes by Peoplehood and The Trap of Blood Quantum.