Gauging the Impact of the European Union on the Nation-StateThe Choice for Europe: Social Purpose and State Power from Messina to Maastricht. By Andrew Moravcisk Jacques Delors and European Integration. By George Ross Adjusting to Europe: The Impact of the European Union on National Institutions and Policies. By Yves Mény , Pierre Muller , and Jean-Louis Quermonne Ideas and Institutions in the European Union: The Case of Social Regulation and Its Complex Decision-Making. By Hans Arnum