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It was founded by Plutarco Elías Calles with the name of Partido Nacional Revolucionario or PNR.
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Pascual Ortiz Rubio was voted for president, and it was the first that was elected representing PNR.
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Lázaro Cárdenas and some more important people of the party made a change in the party's directives and changed the whole vision of the party into a socialist democracy, and they renamed the party as Partido de la Revolución Mexicana or PRM.
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The popular sector was represented by CNOP or Confederación Nacional de Organizaciones Populares. It reagroups many sindical, social, civilian organisms.
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With the objective of becoming a country who supported civilian power with college education and become an institution, Manuel Ávila Camacho refounded the party with the name of Partido Revolucionario Institucional or PRI
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For the first time, under a PRI administrtion and by the first time in Mexico's history, woman had the right of voting and to be voted.
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PRI after winning the elections, PAN accussed PRI of being unfair, they tried to give PAN a dignifying exit so they approved the plurality of parties, recognizing their effort