What are the Provinces of Argentina?

Argentina is a federal republic made up of 23 provinces and the Autonomous City of Buenos Aires. Each province has its own constitution, elected governor and legislature, and keeps all powers not given to the national government. Many of the provinces are older than Argentina itself. After the May Revolution of 1810 broke ties with Spain, the former colonial jurisdictions acted as independent provinces, and they only came together as a federation under the 1853 constitution. The large national territories in the Chaco and Patagonia were run directly by the federal government until most became provinces in the 1950s. The last, Tierra del Fuego, became a province in 1990.