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A History of the Pacific Northwest
to some point on the Mississippi. But since, under the treaty of 1783, Great Britain had a right to navigate the river, that line must come down to a point where it becomes navigable. And wherever that might be, probably at the parallel of 45°, it must be continued west, till it terminates in the Pacific Ocean, to the south of the Columbia.
northwestern point of the Lake of the Woods would strike the Mississippi, but the source of that river proved to be too far south.
