Martha Sandweiss is not an art historian, and her ambitious new book is not a work of art history. Nonetheless, art historians interested in nineteenth-century photography in the United States should get their hands on a copy, because for them this book is not merely important but indispensable. The historian Sandweiss has written a cultural history of how, between the 1840s and the 1890s, photography and the American West came to be entwined. Her primary...