The United States and Great Britain established in 1818 joint claim over the Oregon Territory - the region north of Spanish controlled Upper California up to the southern boundary of Russia's Alaska Territory at North latitude 54°40'. By the late 1830's this arrangement was beginning to fall apart. In the 1840's the expansionist Democrats, including their 1844 presidential candidate, James Polk, claimed the entire region for the United States. Their expansionist desires were expressed by Polk's famous campaign slogan, "Fifty-four Forty or Fight!" The slogan also became a rally cry for Americans desiring to settle the territory. Following Polk's election, the dispute was resolved by the 1846 Treaty of Oregon, which struck a compromise that fixed the U.S./Canadian boundary at 49º North.

Samuel Parker was a missionary who accompanied a fur-trading party on an expedition from Council Bluffs, Iowa to the Oregon Territory. At the time, the region was claimed by both the British and the United States and was little known except to the fur-traders. Parker's map, based on both personal observation and reports of the fur-traders of the Hudson Bay Company, is a landmark in the mapping of the region. The map provides an excellent view of the river systems and tribal territory. It shows several forts, including an early depiction of Fort Hall. The map extends to include much of present-day Canada.

References: Wheat [TMW] #438; Wagner-Camp #70.

Condition: B

Issued folding with scattered foxing and a 1" binding tear at right closed on verso with archival tape.