William A. Slacum (1799- November 1, 1839) was an American sailor and diplomat. He served as a purser in the United States Navy and received a Presidential commission to gather information on the Oregon Country. At that time the region was under the jurisdiction of both the United States and Great Britain. Previously, Slacum served as a diplomat to Mexico.
Read more about William A. Slacum: Early Life, Oregon, Congress