Provinces of Argentina became provinces in 1951. Misiones did so in 1953, and Formosa, Neuquén, Río Negro, Chubut and Santa Cruz, in 1955. The last national territory, Tierra del Fuego, became the Tierra del Fuego, Antártida e Islas del Atlántico Sur Province in 1990. Argentina is a federation of twenty-three provinces and one autonomous city, Buenos Aires. Provinces are divided for administration purposes into departments and municipalities, except for Buenos Aires Province, which is divided into partidos and "localidades". Buenos Aires City itself is divided into communes ("comuna") and non-official neighbourhoods ("barrios"). Provinces hold all the power that they chose not to delegate
Catamarca Province (partly through La Rioja) to Chile by the Paso de San Francisco (4722 m), 64 west from Santiago del Estero to join 38 and 157 north from La Guardia 103 km to Frias where it connects with 89 west from Villa San Martin (Santiago del Estero), and north to Tucuman province at San Pedro, connecting with 64 near Las Cañas. There is an airport at Catamarca. Since its foundation in 1991 by the Catamarcan branch of the Radical Civic Union and minor local parties the Civic and Social Front of Catamarca has dominated state politics. It has held the governor's