In North America, the expeditions of Hearne and Mackenzie are noted, along with numerous rivers, lakes, and other physical features. Mountain ranges snake across the continent, although they appear to be not as confidently placed as the rivers. Cities, such as Boston, Philadelphia, Charleston, and New Orleans are labeled, along with several forts and Native American tribes. The western border of the United States is left open, as is the northern border west of the Great Lakes. Perhaps Pluth is acknowledging the relatively fast growth of the nascent United States and believes that westward expansion will continue, thus leaving the western frontier open for such growth. California and New Mexico are both labeled, although at this point in history they were still part of Mexico. New Albion, S.
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