When are borders justified? Who has a right to control them? Where should they be drawn? Today people think of borders as an island's shores. Just as beaches delimit a castaway's realm, so borders define the edges of a territory, occupied by a unified people, to whom the land legitimately belongs. Hence a territory is legitimate only if it belongs to a people unified by a civic identity. Sadly, this Desert Island Model of territorial politics forces us to choose. If we want territories, then we can either have democratic legitimacy, or inclusion of different civic identities-but not both....

When are borders justified? Who has a right to control them? Where should they be drawn? Today people think of borders as an island's shores. Just as beaches delimit a castaway's realm, so borders define the edges of a territory, occupied by a unified people, to whom the land legitimately belongs. Hence a territory is legitimate only if it belongs to a people unified by a civic identity. Sadly, this Desert Island Model of territorial politics forces us to choose. If we want territories, then we can either have democratic legitimacy, or inclusion of different civic identities-but not both....