As Cold War tensions escalate, the US secretly enters the fight against North Vietnam, while widespread protests spark intense unrest in South Vietnam.

Vietnamese soldiers recall the origins of their brutal conflict across the 17th parallel. The US Civil Rights Movement inspires a new wave of activists.

The Tet Offensive shatters the myth that American victory is at hand. Firsthand witnesses and survivors recall the horror of the Mỹ Lai massacre.

"In the end, the human toll is enormous." The legacy of the war extends far beyond the fall of Saigon. History repeats itself in Iraq and Afghanistan.