William L. Marcy

William L. Marcy served as Secretary of State under Franklin Pierce from 1853 to 1857. A New York lawyer, senator, and governor, he had supervised the War Department during the United States war with Mexico under James K. Polk. His experience joined domestic Democratic politics to the territorial expansion that shaped American diplomacy in the 1840s and 1850s. ¹

Marcy oversaw James Gadsden’s negotiations with Mexico for the purchase of territory along the southern border in 1853. The agreement adjusted the boundary established after the war and provided land sought for a southern railroad route. Relations with Britain also produced a reciprocity agreement with British North America in 1854, opening trade in specified natural products and addressing fishing access. ¹

Cuba exposed the limits of the administration’s expansionist ambitions. American ministers in Europe proposed acquiring the island in the 1854 Ostend Manifesto and suggested that the United States might seize it if Spain refused to sell and American security required action. Publication provoked criticism, particularly because acquisition could extend slavery. Marcy and the administration distanced themselves from the proposal. His secretaryship combined concrete commercial and boundary settlements with expansion projects whose connection to slavery made them increasingly divisive at home. ¹