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Henry Kissinger joined secret negotiations with North Vietnam's representative, Le Duc Tho
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Americans learned that in the spring of 1968 an american platoon under the command of lieutenant william calley had massacred unarmed South Vietnamese.
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American troops had invaded Cambodia to destroy vietcong bases there.
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Ohio National Guard soldiers armed with tear gas and rifles fired on demonstrators at Kent State University, killing 4 students.
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Daniel Ellsberg leaked documents containing details about decisions to expand war, and exposed that they shouldn't have believed them all the time.
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In order to force North Vietnam to resume negotiations, NIxon began the most destructive air raids of the war.