This 1804 map of western¬† North America, entitled “Lousisiana,” was published by British cartographer Aaron Arrowsmith in his famous “A New and Elegant General Atlas.” At the same time, it was printed in Philadelphia by American cartographers Samuel Lewis and Benjamin Tanner. At this time – the year that Lewis and Clark and the Corps of Discovery were beginning their great journey – the American West was unknown.¬† Note that the very skinny Rocky Mountain Range was identified at the Stoney Mountains, and the Great Salt Lake was still unmapped. Cartographic scholar Carl Wheat has described this map as “the most ambitious, and despite its many infirmities, the most informative published attempt to portray the West and Northwest of what is now the United States” up to that time.