On October 20, 1818, American diplomats Richard Rush and Albert Gallatin signed the Convention of 1818 in London, helping resolve outstanding disputes between the United States and Great Britain after the War of 1812. Negotiated while Rush served as U.S. minister to Britain and Gallatin as minister to France, the agreement addressed territorial boundaries, fishing rights, and access to the disputed Oregon Country. It marked an important step toward more stable Anglo-American relations without settling every disagreement between the two powers.
At the heart of the treaty was a boundary settlement extending from the Lake of the Woods to the “Stony Mountains,” now known as the Rocky Mountains. The agreement specified a line running from the lake’s northwesternmost point south to the 49th parallel, then west along that parallel to the Rockies. This established a lasting division between American territory and British North America across a substantial portion of the continent.
West of the Rockies, the negotiators reached a temporary compromise rather than a final boundary settlement. The Oregon Country would remain open to the vessels, citizens, and subjects of both nations for ten years, without either side surrendering its territorial claims. Commonly described as “joint occupation,” the arrangement postponed the sovereignty dispute while allowing continued access to the region.
The convention also confirmed American fishing rights along specified stretches of Newfoundland and Labrador. Its importance lay not in completing the northern border, but in settling a major section of it while creating a framework for managing unresolved claims farther west. The Oregon Treaty of 1846 later extended the 49th-parallel boundary westward from the Rockies to the Strait of Georgia. The agreement of 1818 thus helped shape the modern map of North America through negotiation rather than another war.
