North American Exploration, Volume 3: A Continent ComprehendedThe third volume of North American Exploration, covering 1784 to 1914, charts a dramatic shift in the purpose, priorities, and results of the exploration of North America. As the nineteenth century opened, exploration was still fostered by the growth of empire, but by the 1830s commercial interests came to drive most exploratory ventures, particularly through the fur trade. By midcentury, however, as imperial rivalries lessened and the fur trade