Professor of psychology and “reigning expert on generational change” (Lisa Wade, PhD, author of American Hookup), Jean Twenge does a deep dive into a treasure trove of long-running, government-funded surveys and databases to answer these questions. Are we truly defined by major historical events, such as the Great Depression for the Silents and September 11 for Millennials? Or, as Twenge argues, is it the rapid evolution of technology that differentiates the generations?