Which american negotiated the cease-fire with north vietnam, essentially ending the united states' involvement in the conflict between north and south vietnam?
a. barry goldwater
b. richard nixon
c. henry kissinger
d. robert kennedy

Henry Kissinger was the American who negotiated the cease-fire with North Vietnam, essentially ending the United States involvement in the conflict between the North and South Vietnam. The correct option among all the options given in the question is option "c". He was also the United States Secretary of State during the time in which Richard Nixon and Gerald Ford were the presidents.