The deep rifts in American society are evident. But how did they develop?
Historian Kevin M. Kruse and CNN political analyst Julian E. Zelizer have traced the divide back to 1974, a year in which the country was rocked by political, economic and cultural events (think Watergate). Their new book, Fault Lines: A History of the United States Since 1974, is based on a popular history course they teach at Princeton.
The authors visit with some of the highlights.