What role should the United Nations play in a globalising world? How can it support and embody international democracy? The decline of state sovereignty, an effect of globalisation, is bringing about a crisis both in politics, as a tool to pursue the common good, and in democracy, as the key instrument by which we can control our destinies. The UN, the only organisation with broad political goals and worldwide jurisdiction, has the potential to manage globalisation democratically and promote the common good of humanity. However, it is still controlled by nation states and operates according to power relations typical of the pre-globalisation era. UN reform is therefore crucial, today more than ever. This book examines two areas of reform: first, the creation of a democratic assembly in which world citizens are represented, in order to adapt democracy to meet the challenges of globalisation; and second, the strengthening of the Security Council through democratisation and regionalisation, in order to ensure world security, whose characteristics have evolved significantly in the global age. The contributors come from a wide variety of different backgrounds, including political science, sociology, economics, law, philosophy and history, providing a multifaceted and multidisciplinary debate on this important topic.