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President Ulysses S. Grant appointed Ebenezer Bassett as the U.S. Minister to Haiti and the Dominican Republic in 1869. He was the first African American to serve as a U.S. diplomat anywhere in the world.

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In 1948, President Truman appointed Edward R. Dudley to the position of United States Envoy Extraordinary and Minister‎ Plenipotentiary to Liberia. In accepting this position he became, the first United States Ambassador to Liberia and the first African-American ambassador. Dudley's chief objectives were to implement President Truman's Four Point Plan, which outlined foreign aid to Africa. The plan also sought to provide technical assistance, as well as agricultural and industrial equipment and skills training.