 Some have suggested that the boundaries of a state ought to be determined through a principle of national self-determination. We identify a nation as an ongoing group of persons who share certain cultural, historical and political norms and who identify with each other and with a piece of land. Then we determine the boundaries of the territory by appeal to the size of the group of people and the land they cherish (Miller 1995; Song 2012). This is an appealing idea in many ways: shared nationality breeds a willingness to share the sacrifices that arise from collective decision making; it generates a sense of at-homeness for people. But it is hard to use as a general principle for dividing land among persons when one of the central facts for many societies is that a diversity of nations, ethnic groups and cultures co-mingle on the very same land. 