Treaty of El Pardo (1778)

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The Treaty of El Pardo signed on 11 March 1778 sought to end conflict between Spain and Portugal in the Río de la Plata region, along the modern boundary between Argentina and Uruguay.

Chronology

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March 1778: In 1778, the Spanish Crown acquired the Portuguese islands of Annobón and Bioko (Fernão Pó), as well as the mainland territory between the Niger River and the Ogoue River. This transfer was part of the Treaty of El Pardo, negotiated by King Charles III of Spain and Queen Maria I of Portugal.