Ernst B. Haas pioneered the formation of European integration studies outside the field of International Relations. The European Coal and Steal Community of 1951 was already more supranational than any existing international organisation to date. Supranationalism subsequently expanded with European integration. In his attempt to account for the supranationalism of European regionalism, Haas had developed his neofunctionalism as a general theory, which could be applied to other regions as well as the global level. EU scholars, in contrast, began to treat the EU as a case sui generis insisting on its unique supranational nature. The paper revisits the question of the uniqueness of European regionalism. Combining Ernst Haas’ works on supranational regionalism and liberal nationalism, the EU is approached as a strong form of supranational regionalism that has transformed interstate relations in Europe towards what he called ‘cosmopolitan internationalism’. The paper argues that liberal nationalism is neither a necessary nor a sufficient condition for this transformation. It, however, provides an explanation for the contestation of the EU as a model of liberal regionalism by non-liberal forms of nationalism.
