Kellogg–Briand Pact
As Secretary of State, he was responsible for improving U.S.–Mexican relations and helping to resolve the long-standing Tacna–Arica controversy between Peru and Chile. His most significant accomplishment, however, was the Kellogg–Briand Pact, signed in 1928. Proposed by its other namesake, French foreign minister Aristide Briand, the treaty intended to provide for "the renunciation of war as an instrument of national policy." He was awarded the 1929 Nobel Peace Prize in recognition.