Argentine football league system
Rules establish a system of promotion and relegation, a process where teams are transferred between two divisions based on their performance for the completed season.Those are usually called "zona metropolitana" (metropolitan zone) due to the fact that those tournaments have been historically played by teams from the city of Buenos Aires and the Greater Buenos Aires, plus the addition of twenty one clubs from the cities of Rosario, Santa Fe, La Plata, Zarate, Campana, Luján, Junín, General Rodríguez, Cañuelas, Pilar and Mercedes.[2][3] Although the AAFL was dissolved that same year, AFA has recognised that championship as the first Primera División competition, adding it to its continuity.[4] Until the creation of Campeonato Nacional in 1967, only clubs directly affiliated to AFA had taken part in tournaments organised by the body.From 1986, with the creation of Campeonato Nacional B, teams from regional leagues (clubs indirectly affiliated to AFA) added to the regular competition.