One prominent figure in Black history who served as a U.S. Ambassador is Ralph J. Bunche. Bunche was a distinguished diplomat, political scientist, and academic who became the first African American to win the Nobel Peace Prize in 1950 for his mediation in Israel in the late 1940s.

In 1955, Bunche was appointed as a U.S. Ambassador to the United Nations, making him the first African American to hold such a high-ranking diplomatic position. He played a crucial role in shaping U.S. foreign policy and promoting peace and diplomacy on the international stage during his tenure at the UN.

Bunche's diplomatic achievements and commitment to advancing human rights and social justice made him a trailblazer in the field of international relations and a respected figure in Black history.