Following unification of the U.S. Foreign Service under the Rogers Act in 1924, overseas trade promotion shifted from consuls of the United States to "trade commissioners" employed by the U.S. Department of Commerce. Most but not all trade commissioners were retitled commercial attachés upon creation of the Foreign Commerce Service ("viz.") in 1927. The title "trade commissioner" went out of use in the United States when Commerce's overseas officials were transferred to the Department of State and all three U.S. foreign services (of the Departments of State, Agriculture and Commerce) were merged in 1939 under Reorganization Plan No. II.