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Ngo Dinh Diem, South Vietnam's premier, slain in coup
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North Vietnamese torpedo boats reportedly attack U.S. destroyers in Gulf of Tonkin
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President Johnson orders retaliatory air strikes. Congress approves Gulf of Tonkin resolution
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B-52s bomb DMZ, reportedly used by North Vietnam for entry into South
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U.S. troops invade Cambodia in order to destroy North Vietnamese sanctuaries
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More than 140,000 Vietnamese refugees leave by air and sea, many to settle in U.S. Provisional Revolutionary Government takes control