Mexico

Date range: 1982-2020
Mexico has been dominated for most of the 20th Century by one party, the Institutional Revolutionary Party (Partido Revolucionario Institucional, PRI). The PRI governed Mexico from 1930 until 2000 and, although other parties were legalized, participated in elections and obtained some seats, victory over the PRI was virtually impossible due to the corruption of the electoral system. It was not until the electoral reforms of the 1990s were implemented that Vicente Fox, from the right-wing National Action Party (Partido Acción Nacional, PAN), was able to become the president in 2000. Thus, electoral results before the year 2000 should be taken with caution since elections were not fully democratic.