the Amazon River basin. Portugal would relinquish the colony of Sacramento, on the northern bank of the River Plata in modern-day Uruguay, while getting the territory of the Seven Missions. Following the Guarani War, the treaty was annulled by Spain and Portugal in the Treaty of El Pardo (1761). The border was eventually settled in the First Treaty of San Ildefonso in 1777, with Spain acquiring territories east of the Uruguay River and Portugal acquiring territories in the Amazon Basin. Modern claims The Treaty of Tordesillas was invoked by Chile in the 20th century to defend the principle of an Antarctic sector extending along a meridian to the South Pole, as well as the assertion that the treaty made Spanish (or Portuguese) all undiscovered land south to the Pole. The Treaty of Tordesillas was also invoked by Argentina in the 20th century as part of its claim to the Falkland Islands. See also Catholic Church and the Age of Discovery History of Portugal (1415–1578) List of treaties Notes References Citations Bibliography . . [Wikisource], with English translation of the treaty. , included in the Senate Miscellaneous Documents, Vol. V (1891–1892), pp. 103–30. . . . . . [Wikisource] & [Yale Law], with the original Spanish text, notes, and full English translation of the treaty. . . . . . External links Treaty of Tordesillas (about.com) Treaty of Tordesillas (Portuguese) from Archivo General de Indias 1494 in Portugal 1494 in Spain 1529 in law 1490s treaties History of North America History of South America History of the Americas Latin American history Ferdinand II of Aragon Geopolitical rivalry Isabella I of Castile Meridians (geography) Memory of the World Register in Spain Portugal–Spain relations Portuguese Empire Portuguese colonization of the Americas Spanish colonization of the Americas Spheres of influence History of the Philippines (1565–1898) Tordesillas Treaties of the Spanish Empire 1494 in the Spanish Empire 1494 in the Portuguese Empire History of the province of Valladolid