Oregon Boundary Dispute - Resolution and Treaty

Resolution and Treaty

Although Polk had called on Congress in December 1845 to pass a resolution notifying the British of the termination of joint occupancy agreement, it was not until April 23, 1846 that both houses complied. The passage was delayed (especially in the Senate) by contentious debate, and ultimately a mild resolution was approved, the text of which called on both governments to settle the matter amicably. By a large margin, moderation had won out over calls for war. Unlike Western Democrats, most Congressmen—like Polk—did not want to fight for 54° 40′.

The Polk administration then made it known that the British government should offer terms to settle the dispute. Time was of the essence, because it was well known that the Peel government would fall with the impending repeal of the corn laws in the United Kingdom, and then negotiations would have to begin again with a new ministry. Aberdeen and Louis McLane, the American minister in the United Kingdom, quickly worked out a compromise and sent it to the United States. There, Pakenham and U.S. Secretary of State James Buchanan drew up a formal treaty, known as the Oregon Treaty, which was ratified by the Senate on June 18, 1846 by a vote of 41–14. The border was set at the 49th parallel, the original U.S. proposal, with navigation rights on the Columbia River granted to British subjects living in the area. Senator William Allen, one of the most outspoken advocates of the 54° 40' claim, felt betrayed by Polk and resigned his chairmanship of the Foreign Relations Committee.

The terms of the Oregon Treaty were essentially the same ones that had been offered earlier by the Tyler administration, and thus represented a diplomatic victory for Polk. However, Polk has often been criticized for his handling of the Oregon question. Historian Sam W. Haynes characterizes Polk's policy as "brinkmanship" which "brought the United States perilously close to a needless and potentially disastrous conflict". David M. Pletcher notes that while Polk's bellicose stance was the by-product of internal American politics, the war crisis was "largely of his own creation" and might have been avoided "with more sophisticated diplomacy".

Ambiguities in the wording of the Oregon Treaty regarding the route of the boundary, which was to follow "the deepest channel" out to the Strait of Juan de Fuca and beyond to the open ocean resulted in the Pig War; another boundary dispute in 1859 over the San Juan Islands. The dispute was peacefully resolved after a decade of confrontation and military bluster during which the local British authorities consistently lobbied London to seize back the Puget Sound region entirely, as the Americans were busy elsewhere with the Civil War. The San Juan's dispute was not resolved until 1872; when the pursuant to the Treaty of Washington (1871) an arbitrator (the German Emperor) chose the American-preferred marine boundary via Haro Strait, to the west of the islands, over the British preference for Rosario Strait which lay to their east.

Upper Canada politicians and public, already angry with the Oregon Treaty, were once again upset that Britain had not looked after their interests and sought greater autonomy in international affairs.