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Detailed map of North America, showing the state of Western Explorations on the eve of the great expansion Westward.

Mexico has recently obtained its independence from Spain. Texas is named, but the new Austin Colony does not yet appear. Upper California is under Mexican control. The Rocky Mountain and Missouri Valley regions are described in part based upon the explorations of Long and the various expeditions commissioned by Jefferson. The Northwest region is dominated by Hudson's Bay Company information derived from Arrowsmith's map. The discoveries of Lewis & Clark are much in evidence and American claims extending to 54 degrees, 40 minutes are shown.