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.

As Nixon and Kissinger secretly enact a ruthless bombing campaign, US veterans speak out against the war. The Kent State shootings outrage millions.

"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.