The Tacna–Arica compromise was a series of documents that settled the territorial dispute of both Tacna and Arica provinces of Peru and Chile respectively.
The controversy was a direct aftermath of the War of the Pacific (1879–1883), a confrontation that involved Chile against Peru and Bolivia. Chile won the war and conquered the Peruvian territories of Tarapacá, Tacna and Arica. The defeated Peruvian government was forced to sign the Treaty of Ancón in 1883.
In this Treaty, Tarapacá was annexed to Chile. However, the fate of both Tacna and Arica was to be decided by a plebiscite to be held in 1893. Due to different points of view, both countries were not able to agree on the conditions of this plebiscite. So, it was not held. Then Chile began to colonize the two territories in 1909. Peru followed in 1911 with a break of diplomatic relations. In 1922, Chile and Peru agreed to arbitrate the dispute with the President of the United States. President Coolidge appointed, in 1925, the first US arbitrator, General John J. Pershing; General William Lassiter followed in 1926. Neither negotiator was able to break the deadlock. US Secretary of State Frank B. Kellogg suggested direct negotiations in Washington, D.C. in 1928. It was these negotiations that led to the Treaty of Lima (1929).
The deal that was finally reached allow Peru to reacquire Tacna while Chile kept Arica. Chile had also to make some concessions such as building a Peruvian-administered wharf in Arica and pay a six million-dollar indemnification, among other provisions. In 1999, Chile and Peru at last agreed to fully implement the Treaty of Lima, providing Peru with access to port facilities in Arica.
Coolidge, Calvin (1925) In the matter of the arbitration between the Republic of Chile and the Republic of Peru, with respect to the unfulfilled provisions of the treaty of peace of October 20, 1883, under the Protocol and Supplementary act signed at Washington July 20, 1922. Opinion and award of the arbitrator Government Printing Office, Washington, D.C., OCLC1611324
Dennis, William Jefferson (1931) Tacna and Arica: an account of the Chile-Peru boundary dispute and of the arbitrations by the United States Yale University Press, New Haven, OCLC1613270; reprinted in 1967 by Archon Books, Hamden, Connecticut, OCLC485974
Egaña, Rafael (1900) The Tacna and Arica question. Historical antecedents.--Diplomatic action. Present state of the affair (translated from the Spanish edition by Edwin C. Reed) Barcelona Printing Office, Santiago, Chile, OCLC19301902
González Miranda, Sergio (2006) Arica y la triple frontera: integración y conflicto entre Bolivia, Perú y Chile Aríbalo, Iquique, Chile, ISBN 978-956-8563-00-4, in Spanish
Jane, Lionel Cecil (1930) "The question of Tacna-Arica ..." Transactions of the Grotius Society 15: pp. 93–119
Krieg, William L. (1974) Legacy of the War of the Pacific External Research Program, United States Department of State, Washington, D.C., OCLC2533493
Skuban, William E. (2007) Lines in the sand: nationalism and identity on the Peruvian-Chilean frontier University of New Mexico Press, Albuquerque, New Mexico, ISBN 978-0-8263-4223-2
Wilson, Joe F. (1979) The United States, Chile and Peru in the Tacna and Arica plebiscite University Press of America, Washington, D.C., ISBN 978-0-8191-0685-8
Yepes, Ernesto (1999) Un plebiscito imposible: Tacna y Arica, 1925-1926 Ediciones Análisis, Lima, Peru, OCLC43089352, in Spanish