Treaty of El Pardo (1761)
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The Treaty of El Pardo was signed on February 12, 1761 between representatives of the Spanish Empire and the Portuguese Empire.
Based on the terms of the treaty, all aspects of the Treaty of Madrid were null and void. The reasons for this were the difficulties encountered in the 1750's to clearly establish a border between the Spanish and Portuguese new South American possessions in such an enormous and uninhabitable area.
After the Guarani War of 1756 and his ascension to the throne in 1759, King Charles III of Spain decided that a general revision of the treaties made with Portugal was necessary.