At the same time he proposed in addition to yield to the United States a detached territory north of the Columbia extending along the Pacific and the Straits of Fuca from Bulfinchs Harbor, inclusive, to Hoods Canal, and to make free to the United States any port or ports south of latitude 49° which they might desire, either on the mainland or on Quadra and Vancouvers Island.

The English minister thereupon presented a treaty extending the 49th parallel across Oregon from the Rocky Mountains to the coast, and drawing a line down the strait of Juan de Fuca to the Pacific.