One significant U.S. Senator in Black history is Hiram Rhodes Revels. He was the first African American to serve in the U.S. Senate. Revels, a minister and educator, was elected to represent Mississippi in 1870 during the Reconstruction era following the Civil War. He served a brief term in the Senate, advocating for civil rights and equality for all citizens. Revels' historic election was a landmark moment in U.S. history, as it symbolized progress towards racial equality in government representation.