“Anne Kelly Knowles brings a new approach to our understanding of American ironmaking by coupling geography with the history of technology. Through the first two-thirds of the nineteenth century, Americans transformed their underdeveloped ironworks into a major industry in the world economy. They borrowed the technology and organization techniques of the highly successful works in South Wales, only to discover that differences in natural resources, geography, weather, climate, and community structure thwarted direct technology transfer across the Atlantic. Knowles draws on her experience in Wales and her skills as a geographer to show us the barriers that had to be overcome by the American entrepreneurs and their immigrant workers. She introduces us to the people involved, and with an array of beautiful maps, shows us who went where and what had to be moved about by canals and railroads to achieve the success in ironmaking that would be the foundation of the subsequent American world-class steel industry.”