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August 1964 U.S. destroyers in Gulf of Tonkin report North Vietnamese attacks U.S. Congress passes Gulf of Tonkin Resolution
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first US combat troops were sent to Vietnam in March; by the end of the year there were 200,000 US troops there; first major conventional clash between USA and NVA at Ia Drang
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Nguyen Van Thieu became President of South Vietnam
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demonstrations against the war started in America; My Lai massacre; peace talks began in Paris; 540,000 US troops in Vietnam
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Nixon ordered the secret bombing of Cambodia
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Khmer Rouge took control of Cambodia