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The Oregon Treaty, officially known as the Treaty with Great Britain, in Regard to Limits Westward of the Rocky Mountains, and also known as the Treaty of Washington, is a bilateral treaty between the United Kingdom of Great Britain and Ireland and the United States that was signed on June 15, 1846 in Washington, D.C. The treaty brought an end to the Oregon boundary dispute by settling competing American and British claims to the Oregon Country, which had been jointly occupied by both Britain and the U.S. since the Treaty of 1818.

Contents 1 What led to the treaty 2 Treaty negotiations 3 Treaty definitions 4 Wars caused by treaty ambiguities 5 See also 6 References

The Treaty of 1818 set the U.S.- Canadian boundary along the 49th parallel of north latitude from Minnesota to the "Stony Mountains"^[1] (now known as the Rocky Mountains). West of those mountains was the Oregon Country, and the treaty provided for joint control of that land for ten years. Both countries could claim land and both were guaranteed free navigation throughout.

Joint control steadily grew intolerable for both sides. After a British minister rejected U.S. President James K. Polk's offer to settle the boundary at the 49th parallel north, Democratic expansionists called for the annexation of the entire region up to 54°40', the northern border of the Oregon Country. However, after the outbreak of the Mexican-American War diverted U.S. attention and resources, a compromise was reached.

The treaty was negotiated by U.S. Secretary of State James Buchanan, who later became president, and Richard Pakenham, envoy to the United States and member of the Privy Council of the United Kingdom for Queen Victoria. The treaty was signed on June 15, 1846.

The Oregon Treaty set the U.S. and British North American border at the 49th parallel with the exception of Vancouver Island, which was retained by the British. The 49th parallel became the U.S.-Canadian border between Washington and British Columbia when Canada was formed. The U.S. portion of the region was organized as Oregon Territory on August 14, 1848.

The treaty defined the border in the Strait of Juan de Fuca through the major channel.

• Due to difference in the location of the major shipping channel, both the British and the Americans had settled on the same islands.
• Navigation of "channel[s] and straits, south of the forty-ninth parallel of north latitude, remain free and open to both parties."
• The "Puget's Sound Agricultural Company" retains the right to their property north of the Columbia River, and shall be compensated for properties surrendered if required by the United States.^[2] (The Puget's Sound Agricultural Company was a subsidiary of the Hudson's Bay Company)
• The property rights of the Hudson's Bay Company and all British subjects south of the new boundary will be respected.

In 1859, an unclear description of the border in the treaty later led to the bloodless war known as the Pig War over the ownership of the San Juan Islands.

• James K. Polk
• Oregon Mission

1. ^ LexUM (2000). Convention of Commerce between His Majesty and the United States of America.--Signed at London, 20th October, 1818. Canado-American Treaties. University of Montreal. Retrieved on 2006-03-27.
2. ^ LexUM (1999). Treaty between Her Majesty and the United States of America, for the Settlement of the Oregon Boundary. Canado-American Treaties. University of Montreal. Retrieved on 2007-01-12.

	Pioneer History of Oregon (1806–1890)
Topics	Oregon Country · Oregon Treaty · Oregon missionaries · Executive Committee · Oregon Trail · Oregon boundary dispute · Pacific Fur Company · Provisional Government of Oregon · Hudson's Bay Company
Events	Treaty of 1818 · Russo-American Treaty · Champoeg Meetings · Whitman massacre · Donation Land Claim Act
Places	Fort Astoria · Oregon Mission · Fort Vancouver · Champoeg, Oregon · Fort William · Barlow Road · Whitman Mission
People	George Abernethy · Sam Barlow · Tabitha Brown · Abigail Scott Duniway · Philip Foster · Peter French · Joseph Gale · William Gilpin · David Hill · Jason Lee · Asa Lovejoy · John McLoughlin · Joseph Meek · Ezra Meeker · John Minto · Joel Palmer · Sager orphans · Henry H. Spalding · Marcus Whitman · Narcissa Whitman · Ewing Young
Oregon History	Native Peoples History · History to 1806 · Pioneer History · Modern History