The other big issue is an emotional one. We tend to feel the greatest bonds of solidarity with people that are close to us. There are very few true citizens of the world. We're citizens of individual countries and we really feel the closest bonds to people that live within our nation, and therefore... the nation becomes a kind of social glue. But if you're going to make a national identity compatible with liberalism, it has to be the right kind of national identity. It has to be one that is open to all of the citizens that actually live in the territory of the nation. It can't exclude certain groups by race, by ethnicity, by religious belief and the like, and therefore it needs to be an open identity that is based on essentially liberal ideas.