The Treaty of Ancón was a peace treaty signed by Chile and Peru on 20 October 1883, in Ancón, near Lima. It was intended to settle the two nations' remaining territorial differences at the conclusion of their involvement in the War of the Pacific and to stabilise post-bellum relations between them. Under the treaty's terms, Chile gained control over Tarapacá. Chile was also to retain the conquered provinces of Tacna and Arica for ten years, after which their fate was to be decided by a plebiscite, which was never held. The Tacna–Arica question would only be settled in 1929, through the mediation of the United States under President Herbert Hoover. This treaty, known as the Treaty of Lima, ceded Arica to Chile, while Peru regained Tacna and received USD $6 million indemnity and other concessions. Background During the War of the Pacific and the subsequent Chilean occupation of Peru, a series of parallel governments were established. The Chilean occupying administration established a collaborationist government in La Magdalena headed by Francisco García Calderón in order to be able to represent...