The agreement about a frontier dispute with Chile in 1900 created the National Territory of Los Andes; its lands 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 the Tierra del Fuego, Antártida e Islas del Atlántico Sur Province in 1990. It has three components, although two are nominal because they are not under Argentine sovereignty. The first is the Argentine part of Tierra del Fuego; the second is an area of Antarctica claimed by Argentina that overlaps with similar areas claimed by the UK and Chile; the third comprises the two disputed British Overseas Territories of the Falkland Islands and South Georgia and the South Sandwich Islands.