Vietnam is a tragic land, which has witnessed three successive wars since it won independence in 1945. The purpose of this dissertation is to seek answers to the question of why so many tragedies struck the Vietnamese people, and in particular to examine the contribution made by Sino-American competition to this tragic history. Analysing the IMPACT of Sino-American relations on Chinese and American policies towards Vietnam, the study finds that Vietnam never was the primary subject of American foreign policy, though America was deeply involved in Vietnam during the twenty-five years between 1950 and 1975. Washington’s Vietnam policy was largely based on its perception of China. Likewise, Beijing’s policy towards Vietnam was greatly affected...