To most people living in the West, the Louisiana Purchase made little difference: the United States was just another imperial overlord to be assessed and manipulated. This was not, as Empires, Nations, and Families makes clear, virgin wilderness discovered by virtuous Anglo entrepreneurs. Rather, the United States was a newcomer in a place already complicated by vying empires. This book documents the broad family associations that crossed national and ethnic lines and that, along with the river systems of the trans-Mississippi West, formed the basis for a global trade in furs that had...