Hiram Rhodes Revels
Hiram Rhodes Revels was the first Black American to serve in the U.S. Congress. Revels served from 1869 to 1871. A Republican from Mississippi, Revels was born free to free parents and attended school during a time when educating Black children was illegal. During the Civil War he recruited Black regiments. He was a preacher, educator and civil rights advocate.
Further exploration: http://history.house.gov/People/Listing/R/REVELS,-Hiram-Rhodes-%28R000166%29/
Available at Multnomah County Library: Black Faces, Black Interests: The Representation of African Americans in Congress by Swain, Carol M.