This map was originally issued in an 1838 government report and was reissued in the July 1842 issue of the Monthly Chronicle. The map was intended to awaken public interest in the American occupation of Oregon Territory, which Great Britain also claimed as far south as the Columbia River. Among the many interesting details on the map are the locations of the various trading posts or forts connected with the American and British northwestern fur trade. It covers present day Oregon, Washington, Idaho, Montana and Wyoming. The region east of the Rocky Mountains is named Mandan District. It also shows much of southwestern Canada. The map was copied from John Arrowsmith's 1832 map of British North America. At lower left is the wording of an ultimatum given to the British by Henry Clay, Secretary of State, stating that the 49th parallel will be the boundary. Engraved by M.H. Stansbury.

References: cf. Wheat (TMW) #434; cf. Claussen & Friis #221.

Condition: B

Issued folding with light scattered foxing and toning in the top blank margin. There is a binding trim at right and an associated 4.5" binding tear that has been closed on verso with archival material.