Since the founding of the United States of America, coinciding with the height of the Atlantic slave trade, U.S. officials have based their relations with West Africa primarily on economic interests. Initially, these interests were established on the backs of slaves, as the Southern plantation economy quickly vaulted the United States to prominence in the Atlantic world. After the U.S. abolition of the slave trade in 1808, however, American relations with West Africa focused on the establishment of the American colony of Liberia as a place of “return” for formerly enslaved persons. Following the turn to “legitimate commerce” in the Atlantic and the U.S. Civil War, the United States largely withdrew from large-scale interaction with West Africa. Liberia remained the notable exception, where prominent Pan-African leaders like Edward Blyden, W. E. B. DuBois, and Marcus Garvey helped foster cultural and intellectual ties between West Africa and the Diaspora in the early 1900s. These ties to Liberia were deepened in the 1920s when Firestone Rubber Corporation of Akron, Ohio established a long-term lease to harvest rubber. World War II marked a significant increase in American presence and influence in West Africa. Still focused on Liberia, the war years saw the construction of infrastructure that would prove essential to Allied war efforts and to American security interests during the Cold War. After 1945, the United States competed with the Soviet Union in West Africa for influence and access to important economic and national security resources as African nations ejected colonial regimes across most of the continent. West African independence quickly demonstrated a turn from nationalism to ethnic nationalism, as civil wars engulfed several countries in the postcolonial, and particularly the post-Cold War, era. After a decade of withdrawal, American interest in West Africa revived with the need for alternative sources of petroleum and concerns about transnational terrorism following the attacks of September 11, 2001.