William A. Slacum

William A. Slacum (c. 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.

Early life Slacum was likely born and raised in Alexandria, Virginia. Slacum's family included sister Mary Louisa Slacum Benham and brother George Washington Slacum who served as a consul in the State Department.

On June 8, 1829, William Slacum joined the United States Navy. During his naval career in 1831, Slacum was the purser aboard the USS Potomac as that ship spent four years at sea circumnavigating the globe. Then from 1835 to 1836 Slacum served in Mexico as a Special Diplomatic Agent for the United States. During this time Slacum sent a letter to President Andrew Jackson praising California, then under control of Mexico. This letter is credited with raising Jackson's interest in acquiring that region.

Oregon In 1835 Lieutenant Slacum was selected by President Jackson to travel to Oregon Country to gather information on the affairs of the region. Dated November 11, 1835, Slacum was ordered to inquire about the inhabitants and prospects of those white inhabitants living along the Columbia River. Slacum then sailed from Guaymas, Mexico on June 1, 1836, for the Sandwich Islands, arriving there on November 5, 1836.

Slacum then spent time interviewing Hudson's Bay Company officials such as Dr. John McLoughlin and James Douglas at Fort Vancouver. After this he then spent four days on French Prairie with the missionary Jason Lee examining the settlements. Here the settlers and Slacum parted ways.

On November 1, 1839, Slacum died.