Navigability
Introduction
The Argentine Republic has free navigation of its rivers open to ships from all countries in the world, which can enter and circulate through Argentine rivers without the need to request authorization and pay passage fees. This right is subject to the regulations issued by the Argentine authorities, which must treat foreign vessels in the same way as national vessels, and has been established through multilateral reciprocity treaties and by a constitutional clause.
Royal Pragmatics of the Catholic Monarchs
The Royal Pragmatic of September 1, 1500 issued by the Catholic Monarchs of Castile and Aragon established the monopoly of navigation to and from the recently discovered Spanish Indies for ships flying the banner of Castile, with foreign ships being able to be used only if their own could not do so and with prior authorization. This protectionist measure closed navigation for all ships not belonging to the Spanish monarchy in its possessions. On June 3, 1503 they created the Casa de Contratación de Indias in Seville to which all Indian businesses competed, including navigation.[1].
Portugal in the River Plate
In January 1680, Portugal occupied San Gabriel Island and founded the Colonia del Sacramento on the northern bank of the Río de la Plata, questioning Spain's rights in the area based on its own interpretation of the Treaty of Tordesillas. Shortly after, the colony was occupied by the troops of the governor of Buenos Aires, but returned to Portugal on February 12, 1683 after the signing of the Provisional Treaty of Lisbon on May 7, 1681, with which Portugal provisionally obtained free navigation for its ships in the Río de la Plata, but the prohibition of trade between the establishments of both crowns was maintained.
Free navigation for British slavers
In the Asiento de Negros") approved by the king of Spain on March 26, 1713 in favor of the British slave traders for a period of 30 years, they were allowed free navigation to monopolyally introduce slaves into the Río de la Plata:.