 In 1943, the Mexican Federation founded the Professional League with six clubs of the Primera Fuerza of Mexico City, two clubs from the Liga Occidental (Western League) and two members from the Liga Veracruzana (Veracruz League), being Atlante one of those six clubs of Mexico City.Together, they all became what is known today as the Mexican Primera División.After 4 tournaments, and with the aid of its owner General Jose Manuel Nuñez (a retired militar asked personally by former President Lázaro Cárdenas to watch over the team) as well as of its sensational player Horacio Casarín, the team obtained its first championship in the 1946–47 season.