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The Institutional Revolutionary Party is a Mexican political party that held power in the country—under a succession of names—for 71 years. The PRI is a member of the Socialist International, as is the rival Party of the Democratic Revolution, making Mexico one of the few nations with two major, competing parties part of the same international grouping. However, PRI is not considered a socialist party in the traditional sense; its modern policies being characterized as centrist. Its membership in the International dates from the Mexican Revolution and the founding of the party by Plutarco Elías Calles, when the party had a clearer Institutional orientation. The adherents of the PRI party are known in Mexico as priísta and the party is nicknamed el tricolor because of its use of the colors green, white and red. (via Freebase)