Pan American Games Aires in 1940, the participants decided that the first games should be held in Buenos Aires in 1942. The plans had to be postponed because of World War II. A second Pan American Sports Congress held in London during the 1948 Summer Olympics reconfirmed Buenos Aires as the choice of host city for the inaugural games, which were held in 1951. The games offered 18 sports. Countries that were part of the Commonwealth of Nations such as Canada did not compete at the first Pan American Games. The second games were held in Mexico City, Mexico. Competitions started on March
Buenos Aires its geomorphology along with an inadequate drainage network, the city is highly vulnerable to flooding during periods of heavy rainfall. The Executive is held by the Chief of Government (), elected for a four-year term together with a Deputy Chief of Government, who presides over the 60-member Buenos Aires City Legislature. Each member of the Legislature is elected for a four-year term; half of the legislature is renewed every two years. Elections use the D'Hondt method of proportional representation. The Judicial branch is composed of the Supreme Court of Justice (Tribunal Superior de Justicia), the Magistrate's Council (Consejo de la