When was the Institutional Revolutionary Party established in Mexico?
Institutional Revolutionary Party
1929
The Institutional Revolutionary Party  (Spanish: Partido Revolucionario Institucional, 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 (Spanish: Partido Nacional Revolucionario, PNR), then as the Party of the Mexican Revolution (Spanish: Partido de la Revolución Mexicana, PRM), and finally renaming itself as the Institutional Revolutionary Party in 1946.