Today, six years after the signature of its Constitutive Treaty and 14 years after the first Meeting of the Presidents of South America, the Union of South American Nations (UNASUR) stands as a union of 12 member States dedicated to the integration and long-term economic and social development of South America. With a view to achieving these aims, the Secretary-General of UNASUR has proposed three agendas: a social agenda based on the principle of inclusion, an economic agenda geared towards competitiveness and a political agenda directed towards deepening democracy and public safety. This document, UNASUR: Fostering South American integration through development and cooperation, was prepared by the Economic Commission for Latin America and the Caribbean (ECLAC) at the request of the General Secretariat of UNASUR. In follow-up to the earlier reports published in 2009 and 2011, it offers provide national authorities, academics and students, as well as the general public, an overview of some key issues on the development agenda of the nations of South America.