The Central American Reunification, sometimes called Central Americanism, is the idea of restoring the political unity of the countries of Central America (El Salvador, Guatemala, Honduras, Nicaragua and Costa Rica), as they historically had in particular during the existence of the United Provinces of Central America. At the moment it is followed mainly by groups and political parties of extreme left and internationalist ideology. It should not be confused with the Central American integration process, which is a diplomatic initiative similar to that of the European Union.