One of the most urgent conceptual, normative, and political tasks of our day is to think anew about how polities that aspire to be democracies can accommodate great sociocultural and even multinational diversity within one state. Must every state be a nation and every nation a state? Or should we look instead to the example of countries such as India, where one state holds together a congeries of “national” groups and cultures in a single and wisely conceived federal republic?