In the 1970s the Quinault and Suquamish, like dozens of Indigenous nations across the United States, asserted their sovereignty by applying their laws to everyone on their reservations. This included arresting non-Indians for minor offenses, and two of those arrests triggered federal litigation that had big implications for Indian tribes’ place in the American political system. Tribal governments had long sought to manage affairs in their territories, and their bid for all-inclusive reservation...