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America Transformed: This large wall map integrated topographic and hydrographic detail gained from various European and American explorations of interior North America. It included data from expeditions led by Alexander von Humboldt (northern Mexico), Alexander MacKenzie (Canadian Great Plains), and George Vancouver (Pacific northwest coast), as well as Meriwether Lewis, William Clark, and Zebulon Pike, all of whom were commissioned by President Thomas Jefferson to explore the newly acquired Louisiana Territory. This accumulated knowledge demonstrated that the western part of the continent was not dominated by a single mountain range as was previously hypothesized, but by a complex series of ranges that came to be known as the Rocky Mountains.<br/><br/>This rare map, considered the most accurate representation of North America at the time of its publication, incorporates recent findings from explorations of the American West, Northwest and Canada, and provides an advanced depiction of the geography that would become part of the United States by the mid-nineteenth century. The cartography is derived from the explorations of Pike, Humboldt, Lewis and Clark, Mckenzie, Hearns, Bouchette, Vancouver, Parry and Ross, who ventured into the Northwest Passage, upper Canada, the lower Arctic, the Rocky Mountains and the Sierra Nevadas. The map also incorporates new border settlements with Spain (Mexico) and Britain (Canada).