The most important issue was the future of the Western lands lying between the Alleghany Mountains and the Mississippi. Shelburne was by no means hostile to the American desire for the West. The difficulty was the Canadian frontier. Franklin and others went so far as to demand the whole province of Canada, but Shelburne knew that to yield to this would bring down his Government. After months of negotiation a frontier was agreed upon which ran from the borders of Maine to the St Lawrence, up the river, and through the Great Lakes to their head. Everything south of this line, east of the Mississippi and north of the borders of Florida, became American territory.

Winston Churchill, A History of the English-Sp…, loc. 1536