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June 1967
The Pentagon Papers are a study of the origins and development of the Vietnam War. They were commissioned in June 1967 by Secretary of Defense Robert McNamara after he had developed doubts about the wisdom of that war.

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Jan 31, 1968 - Sept 23, 1968
North Vietnamese and communist Viet Cong forces launched a coordinated attack against a number of targets in South Vietnam.

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August 26–29, 1968
King assassination riots in more than 100 cities followed and marked the end of the civil rights movement. The convention also followed the assassination of Robert F. Kennedy on June 5. Kennedy's assassination derailed the convention, paving the way for Humphrey.

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March 16, 1968
A company of American soldiers brutally killed most of the people—women, children and old men—in the village of My Lai on March 16, 1968. More than 500 people were slaughtered in the My Lai massacre.

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May 4, 1970
The killing of four and wounding of nine unarmed college students by the Ohio National Guard, on the Kent State University campus

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May 15, 1970
May 15, 1970, at Jackson State College in Jackson, Mississippi. On May 14, 1970, city and state police confronted a group of students outside a campus dormitory. Shortly after midnight, the police opened fire, killing two students and injuring twelve.

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Apr 17, 1975 – Jan 7, 1979
The Cambodian Genocide was an explosion of mass violence that saw between 1.5 and 3 million people killed at the hands of the Khmer Rouge, a communist political group.