What will happen to the EU in the wake of enlargement? What are the institutional and policy-making changes in light of enlargement? This book, newly available in paperback, deals with the theoretical, conceptual and historical processes that led to European Union enlargement. It discusses the effects of enlargement on selected European Union policies (agriculture, single market, foreign, security and defence policy, immigration), and looks at the effect of the institutional reforms that were made at Amsterdam and Nice, as well as considering the significance of the debates on the Constitution. It contains chapters by leading European scholars from both sides of the Atlantic. The chapters report current research and employ a variety of methodological and theoretical perspectives. This book is unique in looking at the issues that the EU faces in the aftermath of Eastern enlargement.