The goal of this paper is to study the history of the role taken by the Organization of American States in the protection and promotion of democracy in the continent, so that it is possible to understand its current place and future possibilities. For that, we rely on Ernst Haas' work on institutional change. The hypothesis is that the OAS went through a learning process, during which its original values and implicit theories were questioned. As a result, its fundamental objective was redefined and new mechanisms were introduced so that it could be successful. Not only did the end of the Cold War was a transformative event, so too influenced this learning process the experiences the organization went through in the last twenty years