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- 1879-03-23 War of the Pacific fought between Chile and the joints forces of Bolivia and Peru. Chile successfully takes over Arica and Tarapacá, leaving Bolivia a landlocked country.
- 1879-04-05 Chile declares war on Bolivia and Peru, starting the War of the Pacific.
- 1879-05-21 Battle of Iquique: Chilean naval forces overcome Peruvian ships (War of the Pacific)
- 1879-10-08 War of the Pacific: the Chilean Navy defeats the Peruvian Navy in the Battle of Angamos, Peruvian Admiral Miguel Grau is killed in the encounter.
- 1880-06-07 War of the Pacific: The Battle of Arica, assault and capture of Morro de Arica (Arica Cape), that ended the Campaña del Desierto (Desert Campaign).
- 1904-10-20 Bolivia and Chile sign a treaty ending the War of the Pacific; recognizing Chile's possession of the coast, providing for construction of a railway linking La Paz, Bolivia, to Arica on the coast
- 1929-06-03 Chile and Peru sign the Treaty of Lima, finally resolving their border dispute from the War of the Pacific (1879–83). Chile keeps Arica and Peru regains Tacna.