The law and politics of European integration have been inseparable since the 1960s, when the European Court of Justice rendered a set of foundational decisions that gradually served to 'constitutionalize' the Treaty of Rome. In this book, Alec Stone Sweet, one of the world's foremost social scientists and legal scholars, blends deductive theory, quantitative analysis of aggregate data, and qualitative case studies to explain the dynamics of European integration and institutional change in the EU since 1959.