After the territorial division of South America between Spain and Portugal in the Treaty of Tordesillas (1494) the colonial administration of the continent was divided into Governorates.
Governorate of New Andalusia, granted in 1534 to Pedro de Mendoza, was defined as stretching 200 leagues along the Pacific coast south of the New Toledo grant and reaching east to the Atlantic, covering the vast territory of current days North and Central Argentina, the totality of Uruguay and