sentences:  Its supposition that the Mississippi River extended north to the 50th parallel (into British territory) resulted in the treaty using it as a landmark for a geographically impossible definition of the border in that region.It was not until 1842, when the Webster-Ashburton Treaty resolved these inconsistencies with fixes such as the one that created Minnesota's Northwest Angle, that the U.S.–Canada border was clearly drawn from Maine to the Oregon Country.Similarly, during the drafting of the Northwest Ordinance, the map's inaccuracy in depicting where an east-west line drawn through the southernmost point of Lake Michigan would intersect Lake Erie led to a long dispute over the Ohio–Michigan border that culminated in the Toledo War.