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- Mexico's leading political party. Founded in 1929 as the Partido de la Revolución Mexicana, it took its present name in 1946. It supports state intervention in economic, political, and cultural life. The PRI dominated Mexican politics for most of the twentieth century, staying in power for 71 years until 2000, when it was beaten by PAN - Partido de Acción Nacional It remained an opposition party after the 2006 elections.