Publisher's Synopsis
Less celebrated than his contemporaries Meriwether Lewis and William Clark, Thompson spent nearly three decades, beginning in 1784, surveying and mapping more than 1.2 million square miles of largely uncharted Indian territory. Traveling across the prairies, over the Rockies, and on to the Pacific, Thompson transformed the raw data of his explorations into a map of the Canadian West. Measuring ten feet by seven feet and exhibiting astonishing accuracy, the map became essential to the politicians and diplomats who would decide the future of the rich and promising lands of the West. Yet its creator worked without personal glory and died in penniless obscurity.