William Woods Holden, Governor of North Carolina, became the first U.S. state governor to be removed from office through impeachment.

William Woods Holden
William Woods Holden was an American politician who served as the 38th and 40th governor of North Carolina. He was appointed by President Andrew Johnson in 1865 for a brief term and then elected in 1868. He served until 1871 and was the leader of the state's Republican Party during the Reconstruction Era.
Governor of North Carolina
The governor of North Carolina is the head of government of the U.S. state of North Carolina. Seventy-five people have held the office since the first state governor, Richard Caswell, took office in 1777. The governor serves a term of four years and chairs the collective body of the state's elected executive officials, the Council of State. The governor's powers and responsibilities are prescribed by the state constitution and by law. They serve as the North Carolina's chief executive and are tasked by the constitution with faithfully carrying out the laws of the state. They are ex officio commander in chief of the North Carolina National Guard and director of the state budget. The office has some powers of appointment of executive branch officials, some judges, and members of boards and commissions. Governors are also empowered to grant pardons and veto legislation.
Impeachment
Impeachment is a process by which a legislative body or other legally constituted tribunal initiates charges against a public official for misconduct. Impeachment tends to be confined to ministerial officials as the unique nature of their positions may place ministers beyond the reach of the law to prosecute, or their misconduct is not codified into law as an offense except through the unique expectations of their high office. Both "peers and commoners" have been subject to the process, however.