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
Even though the armed phase of the Mexican Revolution had ended in 1920, Mexico continued to encounter political unrest. A grave political crisis caused by the 1928 assassination of president-elect Álvaro Obregón led to the founding in 1929 of the National Revolutionary Party (, PNR) by Plutarco Elías Calles, Mexico's president from 1924 to 1928.