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| May 14 |
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| Two black students were killed and nine wounded when police opened fire on a dormitory at Jackson State College in Mississippi. | 1 |
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| June 10 |
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| Creation of the new Office of Management and Budget replaced the Bureau of the Budget. | 2 |
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| June 13 |
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| The Commission on Campus Unrest was appointed, with former governor of Pennsylvania William W. Scranton as chairman. | 3 |
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| June 15 |
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| The Supreme Court ruled that exemption from the draft on grounds of conscientious objection need not be based on religious belief but might be granted for moral or ethical reasons. | 4 |
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| June 22 |
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| The Voting Rights Act was extended to 1975, and the voting age reduced to 18, to begin in 1971. | 5 |
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| June 24 |
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| The Senate voted overwhelmingly to repeal the Gulf of Tonkin Resolution of 1965, on which the government's involvement in the Vietnam War was largely based. | 6 |
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| June 30 |
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| The evacuation of Cambodia by American troops was completed as promised by the president. | 7 |
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| July 9 |
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| Creation of the independent Environmental Protection Agency and the National Oceanic and Atmospheric Administration. | 8 |
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| July 24 |
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| A new law provided for the construction of 1.3 million new housing units. | 9 |
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| Aug. 12 |
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| The U.S. Postal Service was established as an independent government agency that would take over the U.S. Post Office and operate the postal service as a business enterprise. | 10 |
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| Aug. 18 |
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| Congress overrode the president's veto of the $4.4 billion appropriation for the Office of Education. | 11 |
| A government ship loaded with nerve gas was scuttled in the Atlantic, 280 miles off the coast of Florida. | 12 |
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| Aug. 24 |
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| The bombing of the U.S. Army Mathematical Research Center at the University of Wisconsin resulted in the loss of one life. The building was wrecked, and many neighboring buildings were badly damaged. Responsibility was assumed by the Weathermen, a radical, violent faction of the Students for a Democratic Society. This incident was followed by many less serious bombings in various parts of the country and led eventually to punitive legislation. | 13 |
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