Institutional Revolutionary Party
The Institutional Revolutionary Party (, PRI) is a Mexican political party founded in 1929 that held uninterrupted power in the country for 71 years from 1929 to 2000, first as the National Revolutionary Party (, PNR), then as the Party of the Mexican Revolution (, PRM), and finally renaming itself as the Institutional Revolutionary Party in 1946.
Lázaro Cárdenas
The Partido de la Revolución Mexicana (PRM) came into being on March 30, 1938 after the party founded in 1929 by Calles, the Partido Nacional Revolucionario (PNR), was dissolved. Cárdenas's PRM was reorganized again in 1946 as the Institutional Revolutionary Party. Calles founded the PNR in the wake of President-elect Obregón's assassination in order to create some way for revolutionary leaders to maintain order and power. Calles could not be re-elected as president, but did hold power through the newly created party. Often called the “official party”, it “was created as a cartel to control localized political machines and interests.”