Why America is still raw over the Vietnam War

Filmmakers Ken Burns and Lynn Novick sorted through 5,000 hours of historical footage and photos for a documentary that took 10 years to create. The new PBS documentary series, “The Vietnam War” takes us to a moment in history that is still not fully understood, and comes at a moment when we’re thinking about America’s role in the world. Judy Woodruff discusses its resonance with Burns and Novick.