The Kent State shooting became a symbol of the anti-war movement during the Vietnam War. On May 4, 1970, Ohio National Guardsmen shot and killed four students during a protest against the United States' invasion of Cambodia. The event sparked outrage and condemnation across the country, capturing the public's attention and highlighting the deep divisions over the war. The phrase "Four Dead in Ohio" became emblematic of the tragedies associated with war and civil unrest, leading to increased activism and changes in public policy regarding military engagement.