The Kent State massacre in Ohio. The Vietnam war. Year 1970. My brother was in Vietnam. He said everyone was wondering what the heck is going on in the United States.

Wikipedia - Kent State shootings

The Kent State shootings (also known as the May 4 massacre or the Kent State massacre)[3][4][5] were the shootings on May 4, 1970 of unarmed college students by members of the Ohio National Guard at Kent State University in Kent, Ohio during a mass protest against the bombing of Cambodia by United States military forces. Twenty-eight guardsmen fired approximately 67 rounds over a period of 13 seconds, killing four students and wounding nine others, one of whom suffered permanent paralysis.[6][7]

Some of the students who were shot had been protesting against the Cambodian Campaign, which President Richard Nixon announced during a television address on April 30. Other students who were shot had been walking nearby or observing the protest from a distance.[8][9]

There was a significant national response to the shootings: hundreds of universities, colleges, and high schools closed throughout the United States due to a student strike of 4 million students,[10] and the event further affected public opinion, at an already socially contentious time, over the role of the United States in the Vietnam War.[11]