In 1930, he released the Clark Memorandum, a rejection of the Roosevelt Corollary and a move towards non-interventionism in Latin America. Hoover did not completely refrain from the use of the military in Latin American affairs; he thrice threatened intervention in the Dominican Republic, and he sent warships to El Salvador to support the government against a left-wing revolution.[213] Notwithstanding those actions, he wound down the Banana Wars, ending the occupation of Nicaragua and nearly bringing an end to the occupation of Haiti.[214]
Hoover placed a priority on disarmament, which he hoped would allow the United States to shift money from the military to domestic needs.[215] Hoover and Secretary of State Henry L. Stimson focused on extending the 1922 Washington Naval Treaty, which sought to prevent a naval arms race.[216] As a result of Hoover's efforts, the United States and other major naval powers signed the 1930 London Naval Treaty.[217] The treaty represented the first time that the naval powers had agreed to cap their tonnage of auxiliary vessels, as previous agreements had only affected capital ships.