American agriculture in the twentieth century has given the world one of its great success stories, a paradigm of productivity and plenty. Yet the story has its dark side, from the plight of the Okies in the 1930s to the farm crisis of the 1980s to today's concerns about low crop prices and the impact of biotechnology. Looking at U.S. farming over the past century, Bruce Gardner searches out explanations for both the remarkable progress and the persistent...