May 4, 1970. It was the fourth day of anti-war demonstrations at Kent State University. Students and faculty had gathered to protest President Richard Nixon's invasion of Cambodia. This unpopular decision had come at a time when the United States had been in the process of withdrawing its forces.

At 12:24 pm, as the Ohio National Guard reached the top of Blanket Hill, 28 Guardsmen turned and fired into the crowd. By the end of the day, 4 students lay dead and 9 more were wounded.

This is the Kent State Massacre.

Art
 "Brown Wooden House" by Johannes Plenio

Music
 "Tumbleweed Texas" by Chris Haugen

Sources

1. “History of the Selective Service System” by Selective Service System (www.sss.gov)
2. “The May 4 Shootings at Kent State University: The Search for Historical Accuracy” by Jerry M. Lewis and Thomas R. Hensley, Kent State University.
3. “Kent State Shooting” by history.com.
4. “Kent State Shootings: A Timeline of the Tragedy” by Sarah Pruitt, history.com.
5. “51 Years Later, Brother Of Kent State Victim Reflects On Iconic Photo — And One That Just Emerged” by Robin Young and Serena McMahon, WBUR.
6. “Four Students Were Killed in Ohio. America Was Never the Same” by Richard M. Perloff, The New York Times.
7. “Looking Back On Kent State University Shooting 5 Decades Ago” by Jeff St. Clair, NPR.
8. Kent State: Death and Dissent in the Long Sixties by Thomas M. Grace (2016)
9. “Naval Air War: The Rolling Thunder Campaign” by Norman Polmar and Edward J. Marolda, Naval History & Heritage Command.
10. “Personal Remembrances of the Kent State Shootings, 43 Years Later” by Daniel Rosenberg, Slate.
11. “Photographer John Filo discusses his famous Kent State photograph and the events of May 4, 1970” by CNN.
12. “The Guardsmen's View Of the Tragedy At Kent State” by William Barry Furlong, The New York Times.