‘What the EU is for’ explores the development of the European Community (EC). For France and Germany, finding a way to live together in a durable peace was a fundamental political priority that the EC was designed to serve. As the Second World War recedes into a more distant past, the motive of peace and security remains a powerful influence on governments and politicians of many member states—and peace could only succeed with adequate economic performance. There are two main explanations for the phenomenon of the EC and EU. One emphasizes the role of member states and their intergovernmental dealings; the other gives greater weight to the European institutions.