Mexico and the United Nations Mexico and the United Nations Mexico is one of the 51 founding members of the United Nations and was admitted into the organization in 1945. Since then, Mexico is a full member of all the UN agencies and participates actively within the organization and has diplomatic relations with most member states. On 26 June 1945, Mexico was represented in San Francisco by Ezequiel Padilla Peñaloza, Francisco Castillo Nájera and Manuel Tello Baurraud in the signing of the United Nations Charter. The country was formally admitted into the organization on 7 November 1945. Since the beginning, Mexico has participated actively in
International Civil Aviation Organization convention, held in London in 1912 allocated the first radio callsigns for use by aircraft. ICAN continued to operate until 1945. Fifty-two countries signed the Chicago Convention on International Civil Aviation, also known as the Chicago Convention, in Chicago, Illinois, on 7 December 1944. Under its terms, a Provisional International Civil Aviation Organization (PICAO) was to be established, to be replaced in turn by a permanent organization when 26 countries ratified the convention. Accordingly, PICAO began operating on 6 June 1945, replacing ICAN. The 26th country ratified the Convention on 5 March 1947 and, consequently PICAO was disestablished on 4