This paper analyses the question of what sovereignty refers to in contemporary world. Starting from Robert Keohane’s article entitled “Ironies of Sovereignty: the European Union and the United States”, this paper investigates the evolutions and characteristics of sovereignty in the EU and the USA through the contribution of Norberto Bobio’s typology, and how sovereignty can be affected by the different conceptions on the State. This leads to evaluate the convergence between the European Union and the United States on the conception of sovereignty. Based on such comparison, this article raises the hypothesis of a “multilevel sovereignty” of States facing growing common pressures from the international systemRecebido em: 16 julho 2015Aceito e...