thumb|left|Territorial changes after the war In 1879, Peru entered the War of the Pacific, after Bolivia invoked its alliance with Peru against Chile. The Peruvian Government tried to mediate the dispute by sending a diplomatic team to negotiate with the Chilean government, but the committee concluded that war was inevitable. On 14 March 1879, Bolivia declared war and Chile, in response, declared war on Bolivia and Peru on 5 April 1879 with Peru following with its own declaration of war the next day.
thumb|left|Territorial changes after the war In 1879, Peru entered the War of the Pacific, after Bolivia invoked its alliance with Peru against Chile The Peruvian Government tried to mediate the dispute by sending a diplomatic team to negotiate with the Chilean .government, but the committee concluded that war was inevitable. On 14 March 1879, Bolivia declared war and Chile, in response, declared war on Bolivia and Peru on 5 April 1879 with Peru following with its own declaration of war the next day.