The United States had entered the conflict in Vietnam as the world’s superpower following its decisive victory over the Axis powers in World War II, but left Vietnam with a humiliating defeat, shockingly high casualties, American public sharply divided and its leaders uncertain of what lay ahead in foreign policy. The nation’s longest and most debilitating war – the only war the U.S. ever lost, had far-reaching consequences and impact on most aspects of American life from the economy, culture to domestic politics and foreign policy – some of which continue to do so today.