In the aftermath of the American Invasion of Cambodia, National Guardsmen killed four students at Kent State University on May 4, 1970 in Kent, Ohio, and Jackson city police and Mississippi state troopers killed one student at Jackson State College and a high schooler passerby, in Jackson, Mississippi on May 15. More than 450 university, college and high school campuses across the country were shut down by student strikes and both violent and non-violent protests that involved more than 4 million students. While opposition to the Vietnam War had been simmering on American campuses for several years, and the idea of a strike had been introduced by the Moratorium to End the War in Vietnam, which advocated a general strike on the 15th of every month until the war ended, the Kent State shootings seemed to provide the spark for students across the US to adopt the strike tactic. On May 8, ten days after Nixon announced the Cambodian invasion, 100,000 protesters gathered in Washington and another 150,000 in San Francisco. Nationwide, students turned their anger on what was often the nearest military facility—college and university Reserve Officers' Training Corps offices. All told, 30 ROTC buildings went up in flames or were bombed. There were violent clashes between students and police at 26 schools and National Guard units were mobilized on 21 campuses in 16 states. Wikipedia [ - ]

In the aftermath of the American Invasion of Cambodia, National Guardsmen killed four students... [ + ]