 The postrevolutionary era is generally marked by political peace whereby conflicts are not resolved by violence.This period has been marked by changes in policy and amendments to the 1917 Mexican Constitution to allow for neoliberal economic policies.Following the formation in 1929 of the precursor to the Partido Revolucionario Institucional (PRI), this party controlled most national and state politics after 1929, and nationalized the oil industry in the 1930s.