 Complete the following phrase:  Slough was born in Cincinnati, Ohio, son of a steamboat builder. Educated at the University of Cincinnati law school, he practiced law in Cincinnati before being elected to the Ohio General Assembly. While serving there, he struck a fellow assemblyman and was expelled for an act unbecoming of a gentleman. His constituents reelected him to fill his vacant seat. In 1857, he relocated to Leavenworth, Kansas, opened a law office, and entered the fight against the introduction of slavery into the territory, during the era of 