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January 30, 1968 - The North Vietnamese join forces with the Viet Cong to launch the Tet Offensive, attacking approximately one hundred South Vietnamese cities and towns
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April 30, 1970 - President Nixon announces that U.S. troops will attack enemy locations in Cambodia. This news sparks nationwide protests, especially on college campuses.
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March 29, 1973 - The last U.S. troops are withdrawn from Vietnam
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August 2 and 4, 1964 - North Vietnamese attack two U.S. destroyers sitting in international waters (the Gulf of Tonkin Incident).
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March 2, 1965 - A sustained U.S. aerial bombing campaign of North Vietnam begins (Operation Rolling Thunder).
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March 8, 1965 - The first U.S. combat troops arrive in Vietnam
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March 16, 1968 - U.S. soldiers kill hundreds of Vietnamese civilians in the town of Mai Lai
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July 1968 - General William Westmoreland, who had been in charge of the U.S. troops in Vietnam, is replaced by General Creighton Abrams
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March 1972 - The North Vietnamese cross the demilitarized zone (DMZ) at the 17th parallel to attack South Vietnam in what became known as the Easter Offensive
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March 1975 - North Vietnam launches a massive assault on South Vietnam. April 30, 1975 - South Vietnam surrenders to the communists
