After his death, a number of scandals—including Teapot Dome—came to light, as did his extramarital affair with Nan Britton; each eroded his popular regard. Harding appointed a number of well-regarded figures to his cabinet, including Andrew Mellon at Treasury, Herbert Hoover at the Department of Commerce, and Charles Evans Hughes at the State Department. A major foreign policy achievement came with the Washington Naval Conference of 1921–1922, in which the world's major naval powers agreed on a naval limitations program that lasted a decade. Harding released political prisoners who had been arrested for their opposition to World War I. His cabinet members Albert B.