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Treaty of Ancón

South American history

Quick Summary

The Treaty of Ancón was a peace treaty signed between Chile and Peru on October 20, 1883, ending the War of the Pacific (1879-1883). This conflict arose from a dispute over the nitrate-rich Atacama Desert, then part of Peru and Bolivia. Chile's superior military strength led to its victory.

Under the treaty, Peru ceded the province of Tarapacá to Chile and agreed to a 10-year Chilean administration of the provinces of Tacna and Arica, with a future plebiscite to decide their final status. This territorial transfer significantly impacted the region's resources and national boundaries. The dispute over Tacna and Arica continued for decades until a 1929 agreement, mediated by the United States, granted Arica to Chile and Tacna back to Peru.

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