For almost three-quarters of a century, the countries of Western Europe have abandoned national sovereignty as an ideal. Nation states are being dismantled: by supranationalism from above, by multiculturalism from below. This book explains why supranationalism and multiculturalism are in fact irreconcilable with representative government and the rule of law. It challenges one of the most central beliefs in contemporary legal and political philosophy, which is that borders are bound to disappear.