Book excerpt: To what extent does a person's own success result in social transformation? This book offers 100 answers, providing thought-provoking examples of how American culture was shaped within a crucial time period by individuals whose lives and ideas were major agents of change. 100 People Who Changed 20th-Century America provides a two-volume encyclopedia of the individuals whose contributions to society made the 20th century what it was. Comprising contributions from 20 academics and experts in their field, the thought-provoking essays examine the men and women who have shaped the modern American cultural experience—change agents who defined their time period as a result of their talent, imagination, and enterprise. Organized chronologically by the subjects' birthdates, the essays are written to be accessible to the general reader yet provide in-depth information for scholars, ensuring that the work will appeal to many audiences.