Here. Highly recommended.

An excerpt:

Baby Veronica is, or is eligible for, enrollment as a citizen of the Cherokee Nation of Oklahoma.  By the way, the Cherokee Nation isn’t like your local public library—not just anyone can join.  It’s like the United States.  Not everyone can join us here—the U.S. has citizenship requirements.  It would be unintelligible to say that someone is 3/256 American, right?  You either are or are not a citizen of a nation.  The usage of blood quantum in this way by the Majority conflates Indian identity and tribal citizenship.