Edmund S. Phelps, professor of political economy at Columbia University, discusses the causes of the economic slump in the United States.

Panelists discuss the fiftieth anniversary of the Tet Offensive, launched in late January 1968, and the lessons learned or forgotten from the Vietnam War for the United States today. 

The National History Center is an initiative of the American Historical Association.

One of the most celebrated diplomats of his generation, Richard Holbrooke helped normalize U.S. relations with China; served as U.S. ambassador to a newly unified Germany and then to the United Natio…

ANDREW ROSS SORKIN: Good afternoon, everybody. My name is Andrew Ross Sorkin with The New York Times and CNBC. I am pleased to introduce today Edmund Phelps -- Professor Edmund Phelps, I should say,…