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The city belonged to the Viceroyalty of Peru and to the [[Peru|Peruvian Republic]] after independence, being under to the domain of the city of [[Tacna]]. During the [[War of the Pacific]] the city was protagonist of the Battle of Arica on the June 7, 1880 inside the Campaign of Tacna & Arica which was won by Chile.  

The city belonged to the Viceroyalty of Peru and to the [[Peru|Peruvian Republic]] after independence, being under to the domain of the city of [[Tacna]]. During the [[War of the Pacific]] the city was protagonist of the Battle of Arica on the June 7, 1880 inside the Campaign of Tacna & Arica which was won by Chile.  

In 1884 Chile and Peru signed the treaty of Ancón, in which Peru ceded the [[Tarapacá Region]] to Chile permanently, and Tacna and Arica for 10 years until the making of a referendum about the sovereignty of the cities.  

In 1884 Chile and Peru signed the treaty of Ancón, in which Peru ceded [[Tarapacá Region|Tarapacá]] to Chile permanently, and Tacna and Arica for 10 years until the making of a referendum about the sovereignty of the cities.  

The referendum wasn't held and in the 1920s both countries agreed to have arbitration of the United States, which said a referendum couldn't be held because of the Chilean Nationalist groups on Arica and Tacna that were nationalizing by force the zone, and also said that Chile should return Tarata to Perú, which was applied in 1925.  

The referendum wasn't held and in the 1920s both countries agreed to have arbitration of the United States, which said a referendum couldn't be held because of the Chilean Nationalist groups on Arica and Tacna that were nationalizing by force the zone, and also said that Chile should return Tarata to Perú, which was applied in 1925.