The resolution that marked the end of the War of the Pacific in 1884 was the signing of the Treaty of Ancón. This treaty was signed between Chile and Peru, concluding the conflict that erupted in 1879 over territorial disputes in the Pacific coast regions, primarily involving Chile, Peru, and Bolivia. Under the terms of the Treaty of Ancón, Peru ceded significant territory to Chile, including the region of Tarapacá. This treaty significantly expanded Chilean territory and established Chile as a major power in the region. The war had profound implications for national boundaries and relations in South America.