What did Blanche K. Bruce accomplish? He served in the United States Senate.
He served as governor of Mississippi.
He served as Speaker of the House in Mississippi.
He served as state court judge during Reconstruction.

He served in the United States Senate.

Explanation:

Blanche K. Bruce born on March 1, 1841 was the second African-American person to be elected as a Senator to the United States Senate and the first African-American Senator who served a full term from 1875 to 1881.

Senator Bruce was a Republican representative from Mississippi in the United States Senate. Prior to serving as a US Senate, he aslo served the Mississippi Senate as the sergeant at arms, a county assessor, sheriff, and member of the Board of Levee Commissioners.