"National Territory" is translated from "Territorio nacional", a term used for territories in Argentina. A 1862 law determined that the territories under control of Argentina but outside the frontiers of the provinces would be called national territories. This allowed in 1884 to establish the governorates of Misiones, Formosa, Chaco, La Pampa, Neuquén, Ró Negro, Chubut, Santa Cruz and Tierra del Fuego. The agreement about a frontier dispute with chile in 1900 created the national territory of Los Andes, whose territories were incorporated into Jujuy, Salta and Catamarca in 1943.
La Pampa and Chaco 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 a province in 1990.