An American Ordeal is the first comprehensive interpretive history of the antiwar movement in the United States throughout the Vietnam era. Beginning with the rise of a liberal peace movement against atmospheric nuclear testing from 1955 to 1963, the authors describe the emergence of radical pacifists and politically motivated groups who eventually created a diverse coalition against the Vietnam War. They examine how extremist elements came to dominate the movement in the late 1960s, to be supplanted by a larger consensus of liberal and pacifist groups in the early 1970s.