One significant figure in Black history who served as a U.S. Ambassador is James Weldon Johnson. Johnson was a prominent civil rights activist, author, and educator who was appointed as the U.S. Consul to Venezuela and Nicaragua in the early 1900s. Johnson's diplomatic service helped advance U.S. interests in South America while also breaking racial barriers as one of the first African Americans to hold such a position.

Another notable figure is Edward Dudley, who became the first African American to serve as a U.S. Ambassador when he was appointed as the Ambassador to Liberia in 1949. Dudley's appointment was a milestone in U.S. diplomatic history and paved the way for future generations of Black diplomats to represent the United States on the international stage.

These individuals, among others, have made significant contributions to Black history through their service as U.S. Ambassadors, showcasing the talent, resilience, and expertise of African Americans in the field of diplomacy.