Union of South American Nations in Mitad del Mundo, Ecuador, where the cornerstone was laid for the headquarters of the General Secretariat of the Union. In April 2018, six countries suspended membership: Argentina, Brazil, Chile, Colombia, Paraguay and Peru. In August 2018, Colombia announced its withdrawal from the organization. At the Third South American Summit on 8 December 2004, presidents or representatives from 12 South American nations signed the "Cusco Declaration", a two-page statement of intent announcing the foundation of the South American Community. Panama and Mexico attended the signing ceremony as observers in Brazil. The mechanics of the new entity came out of the
Union of South American Nations First South American Community of Nations Heads of State Summit, which was held in Brasília on 29–30 September 2005. An important operating condition of UNASUR is that no new institutions will be created in the first phase, so as not to increase bureaucracy, and the community will use the existing institutions belonging to the previous trade blocs. Between the 15th and 19th centuries, the Spanish and Portuguese colonization brought about the establishment and development of colonial empires in the Americas that integrated politically, economically and culturally vast extensions of the continent each with their respective metropolis. Since the Spanish American