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
President pro tempore of the Union of South American Nations Science, Technology and Innovation; South American Council of Fight against the South American Narcotráfico, Council of Defense South American, South American Council of Economy and Finances, and South American Council. President pro tempore of the Union of South American Nations The President Pro Tempore of the Union of South American Nations is the head position and representant of the Union of South American Nations (UNASUR). At international meetings, the declarations and concerted opinions of the supranational organism are presented by the President Pro Tempore. The office is exercised for a one-year period on a pro tempore basis by one of