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| 1967, Jan. 3 |
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| Hanoi offered to negotiate in return for an unconditional cessation of bombing. | 1 |
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| Feb. 8 |
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| An exchange of letters between Lyndon Johnson and Hô Chi Minh proved fruitless. | 2 |
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| Feb. 8–14 |
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| Bombing paused during the Tet (Vietnamese New Year) holiday. British prime minister Harold Wilson and Soviet premier Kosygin tried to persuade the U.S. to cease its bombing as a prelude to negotiations. | 3 |
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| March 18 |
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| The constituent assembly unanimously approved the draft of the new constitution. It went into effect on April 1. | 4 |
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| March 22 |
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| Thailand agreed to let U.S. bombers use its bases in attacks on targets in Vietnam. | 5 |
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| May 18–19 |
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| U.S. troops moved into the demilitarized zone dividing North and South Vietnam. Heavy bombing of the power plant at Hanoi ensued. | 6 |
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| June |
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| By midyear, U.S. forces numbered 463,000, to which the allied powers added many more. The South Vietnamese army counted 600,000. The North Vietnamese had 50,000 regulars and 294,000 NLF and other irregulars. The North also had the support of some 50,000 Chinese laborers who repaired the damage done by bombing. Furthermore, they had the advantage of terrain (infiltration of troops over the jungle Ho Chi Minh Trail in eastern Laos) and of the reluctance of the U.S. to provoke Chinese or Soviet intervention through the invasion of North Vietnam or through outright attack on Haiphong or Hanoi. Despite the acute antagonism that had developed between the USSR and China, the Chinese throughout the Vietnamese War allowed Soviet supply trains to cross Chinese territory to reach their destination. | 7 |
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| July 6–11 |
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| While in Vietnam, Secretary McNamara heard Gen. William Westmoreland's request for an additional 70,000 troops. | 8 |
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| Sept. 3 |
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| In South Vietnamese elections, Generals Thieu and Ky became president and vice president, securing about 35 percent of the vote. | 9 |
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| Dec. 26 |
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| The South Vietnamese threatened to pursue Communist troops into Cambodia if they used that country as a base for infiltrating South Vietnam. In reply, Beijing promised (Dec. 29) Cambodia support if the U.S. extended hostilities to that country. | 10 |
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