P. B. S. Pinchback

Pinckney Benton Stewart Pinchback (May 10, 1837 –  December 21, 1921) was the first African American to become governor of a U.S. state. Pinchback, a Republican, served as the governor of Louisiana for thirty-five days, from December 9, 1872, to January 13, 1873.According to Nicholas Lemann in Redemption: The Last Battle of the Civil War, Pinchback was "an outsized figure: newspaper publisher, gambler, orator, speculator, dandy, muountebank- served for a few months as the state's governor and claimed seats in both houses of Congress following disputed elections but could not persuade the members of either to seat him."
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