Treaty of El Pardo (1761)
Based on the terms of the treaty, all aspects of the Treaty of Madrid were repealed. The reasons for this were the difficulties encountered in the 1750s to establish a clear border between the Spanish and Portuguese new South American possessions in such an enormous undeveloped area.
After both the Guarani War of 1756 and the accession to the throne of King Charles III of Spain in 1759, the Spanish king had decided that a general revision of the treaties made with Portugal was necessary.
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