Institutional Revolutionary Party
The Institutional Revolutionary Party (, 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 (, PNR), then as the Party of the Mexican Revolution (, PRM), and finally renaming itself as the Institutional Revolutionary Party in 1946.
Institutional Revolutionary Party
After several decades in power the PRI had become a symbol of corruption and electoral fraud. The conservative National Action Party (PAN) became a stronger party after 1976 when it obtained the support from businessmen after recurring economic crises. Consequently, the PRI's left wing separated and formed its own party, the Party of the Democratic Revolution (PRD) in 1989.