Relations with Chile, strained since Bolivia's defeat in the War of the Pacific (1879–83) and its loss of the coastal province of Atacama, were severed from 1962 to 1975 in a dispute over the use of the waters of the Lauca River. Relations were resumed in 1975 but broken again in 1978 over the inability of the two countries to reach an agreement that solved the Atacama border dispute, that might have granted Bolivia a sovereign access to the sea. In the 1960s, relations with Cuba were broken by the Bolivian dictatorship following Castro's rise to power but resumed under the Paz Estenssoro Administration in 1985, which came to power through democratic elections.