In 1970 the anti-war movement had plenty to rally against. Thousands of American troops were being killed and wounded in Vietnam and America's youth were often the ones paying the price. U.S. involvement in Vietnam had dominated foreign policy through most of the 1960s and when President Nixon announced an expansion of the theater of war to include Cambodia, many students at Kent State University were outraged. Campus protests were met with Ohio National Guard troops and on May 4th the clashes turned deadly. Four students were killed that day and nine others wounded. This is a story of the anti-war movement, including the story of one of the most famous photographs that defined the decade.