Mexique - Segunda Division

The 1993–94 season Segunda División champion was the last to be promoted to the Primera División. In 1994–95 season, the Mexican Football Federation created the "Primera División A" (renamed Ascenso MX in 2012) with 15 teams from the Segunda División, and all other teams remained in the league that continued to be called 'Segunda División' (Second Division) but at the new third tier of the Mexican football league system.

Each season has Segunda División teams divided into geographic zones with matches predominantly among the teams of that group. Each season had one tournament.

In 2008, the Mexican Football Federation, with the approval of the chairmen of the clubs in the Second and Third tiers, change the format of the league dividing the number of teams into two divisions, the Liga Premier de Ascenso (Promotional Premier League) and the Liga de Nuevos Talentos (League of New Talents). Each of the new leagues was divided into geographic groups. The winning club could earn promotion to Primera División A, renamed Liga de Ascenso in 2009, provided their stadium and financial stability met the licensing requirements of Liga de Ascenso. From 2011 and 2016, no teams were relegated to Liga Premier, although Pumas Morelos was to be relegated in 2013 but they dissolved before they could play in the lower league. Promotion still occurred during these years provided the club was licensed to participate. In June 2016, Ascenso MX announced they would resume relegating teams. Since that year only Loros UdeC (2017) and Murciélagos F.C. (2018) were relegated from the upper level.

In 2020 Ascenso MX became a U-23 league with some players over 23 as reinforcements, the new league was called Liga de Expansión MX, two Liga Premier teams were invited to the new category: Tepatitlán F.C. and Tlaxcala F.C., teams who had won their promotion in 2016 and 2018 but were rejected in the second level for not meeting the requirements to participate. Since that year, the requirements to be admitted to the second level have been tightened, so only one team, Alacranes de Durango, could be promoted in 2022, although it only remained in the Liga de Expansión for one year.