During the War of the Pacific (between Peru and Chile), in the first months of 1880, the U.S. Government offered to mediate in the conflict. This initiative took shape in the celebration of a Conference of Peace in Arica, on board of the navy warship Lackawanna, which was not successful.
The following year, with the beginning of the Garfield Administration, the U.S. policy was favorable to find a solution to the conflict between Peru and Chile. The U.S. Government supported an impartial mediation without trying to dictate the peace terms and that did not involve European intervention. The mediation formula was maintained, even Secretary of State James Blaine being replaced by Frederick Frelinghuysen in December of 1881.
On the other hand, from the 1890s and with the coming of the 20th century, the U.S. investments in Peru increased rapidly, especially in the mining business, which contributed to the incorporation of the Peruvian exporting economy to the United States.