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.
Liberal Party (Mexico)
When Mexico achieved its independence in 1821, the Mexican political life was altered by constant struggles between Liberals and Conservatives. The Liberal Party enacted the Federal Constitution of 1857, which along with the Plan of Ayutla (1854) and other liberal reforms polarized Mexican society to lead the Reform War (1857–1861), the Second French Intervention in México (1862–1867) and the Second Mexican Empire (1863–1867).