The Institutional Revolutionary Party (Spanish: Partido Revolucionario Institucional, PRI) is a Socialist-leaning political party in Mexico founded in 1929. It held 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.
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