55 American History Photos And The Incredible True Stories Behind Them

Fourteen-year-old Mary Ann Vecchio screams after the Ohio National Guard opened fire on students at Kent State on May 4, 1970, killing four and wounding nine. The troops had descended on campus to oversee a protest against an escalation in the Vietnam War.

When they opened fire, they struck — and killed — a number of students who were not protesting but merely watching on their way between classes.