11. The My Lai Massacre (1968)
During the Vietnam War, U.S. troops entered the village of My Lai and killed hundreds of unarmed Vietnamese civilians, the majority of whom were women and children. Initially, the massacre was covered up by military officials and only came to light through whistleblowers and journalists. The My Lai Massacre remains a deeply disturbing and often underemphasized episode in American military history. Learn more.
