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President Truman sent a 35-man military advisory group to help French fight to maintain power in Vietnam.
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Ngo Dinh Diem, South Vietnam's premier, is killed
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U.S. planes begin combat missions over South Vietnam. In June, 23,000 American soldiers are involved in combat. By the end of the year over 184,000 U.S. troops in area.
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B-52s bomb DMZ, reportedly used by North Vietnam for entry into South.
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U.S. has almost 525,000 men in Vietnam. In My Lai massacre, American soldiers kill 300 Vietnamese villagers.
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U.S. troops invade Cambodia in order to destroy North Vietnamese sanctuaries.
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Election of National Assembly paves way for reunification of North and South.
