The crisis of the Union of South American Nations (Usan) presents a thick institutional clothing that also reflects the scenario of the end of the "progressive" cycle and the coming to power of right-wing governments in different countries of the region. Using journalistic sources and official documentation, as well as interviews with academics and officials of the Agency, the Authors examine the chronicle of the acephaly of the General Secretariat and contribute to the theoretical and political debate on the experience of Unasur and its current crisis.
