One of the most successful initiatives which embodies the principles of effective public diplomacy is the creation by international treaty in the 1950s of the European Coal and Steel Community which later became the European Union. Its original purpose after World War II was to tie the economies of Europe together so much that war would be impossible. Supporters of European integration see it as having achieved both this goal and the extra benefit of catalysing greater international understanding as European countries did more business together and the ties among member states' citizens increased. Opponents of European integration are leery of a loss of national sovereignty and greater centralization of power.