Convention of 1818 and the Postwar Settlement

The Convention of 1818, signed in London on October 20, 1818, was a diplomatic agreement between the United States and Great Britain that resolved several outstanding issues from the War of 1812. It established the 49th parallel as the boundary between the Missouri Territory and British North America from the Lake of the Woods to the Rocky Mountains, granted American fishermen rights off Newfoundland and Labrador, renewed the commercial convention of 1815, and provided for the joint occupation of the Oregon Country for ten years. The convention marked a significant step in postwar Anglo-American reconciliation and set a precedent for peaceful dispute resolution.

Historical Context

The War of 1812 concluded with the Treaty of Ghent in December 1814, but the treaty left many contentious issues unresolved. These included the precise boundary between the United States and British North America, particularly the northwestern boundary of the Louisiana Purchase; fishing rights off the coast of Newfoundland and Labrador; and the status of the Oregon Country. Additionally, both nations had engaged in a naval arms race on the Great Lakes until the Rush-Bagot Agreement of 1817 limited vessels there. The American government sought to reduce military expenditures and expand trade, while Britain, dealing with post-Napoleonic European affairs, aimed to minimize costs in North America. Diplomatic commissions had been established under the Treaty of Ghent to resolve boundary disputes, but several questions remained, including the ownership of islands in Passamaquoddy Bay and the northeastern boundary. These broader negotiations set the stage for the Convention of 1818.

What Happened

Negotiations for the convention took place in London in the autumn of 1818. The American plenipotentiaries were Albert Gallatin, who was also minister to France, and Richard Rush, the acting secretary of state and minister to Britain. Britain was represented by Frederick John Robinson, president of the Board of Trade and Treasurer of the Navy, and Henry Goulburn, a colonial undersecretary. The convention comprised six articles. The first article settled fishing rights: Americans were granted permanent rights to fish in specific waters off Newfoundland and Labrador, and to dry and cure fish in unsettled bays and harbors, while renouncing any claims to fish within three miles of other British colonial coasts. The second article established the boundary line from the Lake of the Woods to the Rocky Mountains along the 49th parallel, with provisions for adjusting the line if the lake’s northwestern point did not lie on that parallel. The third article provided for the joint occupation of the Oregon Country (defined as territory west of the Rocky Mountains) for ten years, allowing citizens and subjects of both nations to use and settle there without prejudice to either’s claims. The fourth article extended the commercial convention of 1815 for ten years, except for clauses relating to certain trade restrictions. The fifth and sixth articles dealt with the ratification process and the duration of the convention.

Why It Matters

The Convention of 1818 was a landmark in Anglo-American relations. It resolved several immediate postwar disputes and created a framework for future cooperation. The 49th parallel boundary became the foundation for the Canada-United States border west of the Great Lakes, influencing later settlements such as the Webster-Ashburton Treaty of 1842 and the Oregon Treaty of 1846. The joint occupation of Oregon, though temporary, paved the way for eventual partition. The fishing articles removed a major source of friction and lasted until early twentieth-century disputes. Scholars view the convention as a turning point that ended the era of conflict initiated by the American Revolution and the War of 1812, leading to a “special relationship” based on economic and strategic interests. It also demonstrated that both powers could negotiate differences without resorting to war.

Document

The Convention of 1818 is a treaty comprising a preamble and six articles. The original full texts are held in the national archives of the United States and the United Kingdom, and a transcription is available through Yale’s Avalon Project.

Date

October 20, 1818.

Author

The signatories were Albert Gallatin and Richard Rush for the United States, and Frederick John Robinson and Henry Goulburn for Great Britain, acting with full powers from their respective governments.

Historical Context

The convention was negotiated in the aftermath of the War of 1812 and the Treaty of Ghent, which had left many issues unresolved. It also followed the Rush-Bagot Pact of 1817, which had demilitarized the Great Lakes. Both nations wished to stabilize relations and promote trade, while Britain sought to secure its interests in the fur trade and the strategic Pacific Northwest. The negotiations also addressed the status of Astoria, a trading post on the Columbia River, which had been captured by the British during the war and was returned to American control in October 1818 as part of the settlement.

Transcript

The full text is available at the Avalon Project. The preamble reads: “The United States of America, and His Majesty The King of the United Kingdom of Great Britain and Ireland, desirous to cement the good Understanding which happily subsists between them, have, for that purpose, named their respective Plenipotentiaries…” The articles are as described in the “What Happened” section.

Modernized Transcript

In modern language, the convention granted American fishermen permanent access to Newfoundland and Labrador’s waters for fishing and fish curing, in exchange for renouncing claims elsewhere. It set the U.S.-British boundary at the 49th parallel from the Lake of the Woods to the Rocky Mountains. It allowed citizens of both nations to settle in the Oregon Country for ten years without affecting territorial claims. It renewed the 1815 commercial agreement for ten years, with exceptions for certain articles.

What the Document Tells Us

The convention demonstrates the willingness of both nations to compromise and formalize a peaceful coexistence after a costly war. It reflects the primacy of commercial and territorial interests, and the ability of diplomats to find pragmatic solutions. The articles on Oregon indicate the uncertainty of the region’s future and the desire to avoid immediate conflict. The boundary line of the 49th parallel became a lasting symbol of the rapprochement.

Limitations and Bias of the Source

As a treaty, the document represents the perspective of the two governments and does not account for the Indigenous peoples who inhabited the affected territories. The wording is legalistic and reflects the diplomatic language of the time. The treaty’s provisions on Oregon were silent on Native land rights, and the joint occupation arrangement overlooked Indigenous sovereignty. Additionally, the fishing rights granted were limited and later led to disputes over interpretation. The document is a primary source but requires contextualization to understand its full impact.

Citation

“Convention of 1818 between the United States and Great Britain,” Avalon Project, Yale Law School, accessed [date], https://avalon.law.yale.edu/19th_century/conv1818.asp.

Primary Sources

In addition to the Convention itself, primary sources include the Treaty of Ghent (1814), the Rush-Bagot exchange of notes (1817), and diplomatic correspondence between Gallatin, Rush, and British officials. The Avalon Project provides digital texts. The Office of the Historian of the U.S. Department of State offers a summary of the negotiations. Letters and memoirs of the negotiators, such as Albert Gallatin’s writings, also provide insight.

Further Reading

• Donald R. Hickey, The War of 1812: A Forgotten Conflict (University of Illinois Press, 1989).
• J.C.A. Stagg, Mr. Madison’s War: Politics, Diplomacy, and Warfare in the Early American Republic (Princeton University Press, 1983).
• Robert M. Owens, Red Dreams, White Nightmares: Pan-Indian Alliances in the Anglo-American Borderlands (University of Oklahoma Press, 2015).
• “Convention of 1818,” U.S. Department of State, Office of the Historian, https://history.state.gov/milestones/1801-1829/rush-bagot.

References

1. Avalon Project, “Convention of 1818 between the United States and Great Britain,” https://avalon.law.yale.edu/19th_century/conv1818.asp
2. Office of the Historian, U.S. Department of State, “Rush-Bagot Pact, 1817 and Convention of 1818,” https://history.state.gov/milestones/1801-1829/rush-bagot
3. EBSCO Research Starters, “Convention of 1818 Signed,” https://www.ebsco.com/research-starters/history/convention-1818-signed
4. Oregon Historical Quarterly, “The Oregon Question, part 2,” Wikisource, https://en.wikisource.org/wiki/Oregon_Historical_Quarterly/Volume_1/The_Oregon_Question%2C_part_2