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
Member states of the League of Nations Free State, Ethiopia, the Dominican Republic, Mexico, Turkey, Iraq, the Soviet Union, Afghanistan, and Ecuador. Of the 42 founding members, 23 (or 24, counting Free France) remained members until the League of Nations was dissolved in 1946. A further 21 countries joined between 1920 and 1937, but 7 left, withdrew or were expelled before 1946. Countries are listed under the year in which they joined. The word "withdrew" indicates that a country left of its own choice. The word "left" indicates a country that ceased to exist because of annexation by Germany, Italy or the Soviet Union. The Soviet Union