Book excerpt: A Companion to 20th-Century America is an authoritative survey of the most important topics and themes of twentieth-century American history and historiography. Contains 29 original essays by leading scholars, each assessing the past and current state of American scholarship Includes thematic essays covering topics such as religion, ethnicity, conservatism, foreign policy, and the media, as well as essays covering major time periods Identifies and discusses the most influential literature in the field, and suggests new avenues of research, as the century has drawn to a close