This book assesses the extent of the authority that the Organisation of American States holds over the key issues confronting its member states. It explores the extent and significance of the transformation of the OAS since 1991: its roots, the reasons for and extent of its emergence, and the role that the organisation currently plays in the promotion of regional governance in the two key issue-areas of security and the defense and promotion of democratic norms and principles of good governance. By assessing where the OAS has succeeded and failed, Horwitz provides an in-depth explanation of how cooperation and consensus works in the Inter-American system. This study reports on indications that the OAS is looking for ways to act multilaterally in certain security issues, for instance trying to develop a drug regime. The OAS is also actively defending and promoting democratic norms and rules. Presently, the Western Hemisphere is at a crossroads and it is too soon to tell whether the OAS will adapt and succeed or whether the efforts to integrate OAS member states through specific common security policies and the democracy paradigm will add to the list of previous regional integration failures. This book is an important contribution to the debate on the role of International Organisations in shaping the Inter-American system. By looking at specific cases such as the defence of democracy, where the OAS is working through specific agencies and promoting cooperation and consensus, we are able to discern the successes and failures of the OAS.