In May 1970, four million students went on strike across the country, shutting down classes at hundreds of colleges, universities, and high schools and demanding an end to the Vietnam War.
Armed Ohio National Guardsmen advance through the Kent State University campus, forcing back student participants in an antiwar demonstration on May 4, 1970. Guardsmen injured nine students and killed four during the protests that day in what has come to be called the Kent State massacre. (Howard Ruffner / Getty Images)
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