<Ul> <Li> Politics of Mexico </Li> <Li> Political parties </Li> <Li> Elections </Li> </Ul> <Li> Politics of Mexico </Li> <P> The Institutional Revolutionary Party (Spanish: Partido Revolucionario Institucional, PRI) is a Mexican political party founded in 1929 that held power uninterruptedly 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 . </P> <P> Though it is a full member of the Socialist International (along with its rival, the left - wing PRD, they make Mexico one of the few nations with two major, competing parties part of the same international grouping), the PRI is not considered a social democratic party in the traditional sense . </P>

Which country had a one party system for seventy one years
find me the text answering this question