The Treaty of Paris 1783 generally concluded boundary disputes between the U.S. and Canada, but controversy remained over the provision that the dividing line in this area be the “usual water communication to the northwesternmost angle of the Lake of the Woods and then due west to the Mississippi,” because maps used at the time were wrong about the headwaters of the Mississippi and placed them at the Lake of the Woods. In 1842, the Webster-Ashburton Treaty established a basis for lasting peace and friendship between the U.S. and Canada by choosing the Pigeon River as the “customary waterway” and making it the international boundary line, running to the mouth of Pigeon River and up the river through the North and South Fowl Lakes, while providing that the route from Lake Superior to the Lake of the Woods and the Grand Portage would remain free and open to citizens of both countries. The actual survey waited until the Treaty of 1908 between Great Britain and the U.S.