What Was the Vietnam War?By: Jim O'Connor, Who HQ Illustrator: Tim Foley Series: What Was? Learn how the United States ended up fighting for twenty years in a remote country on the other side of the world. The Vietnam War was as much a part of the tumultuous Sixties as Flower Power and the Civil Rights Movement. Five US presidents were convinced that American troops could end a war in the small, divided country of Vietnam and stop Communism from spreading in Southeast Asia.