The French withdrew from Vietnam in 1954 after their defeat to the communists at Dien Bien Phu.
The freedom fighters who defeated the French were Communists so America was against them.
This led to the formation of the International Committee of Justice to resolve the Vietnam dispute and decided that Vietnam should be divided on the 17th parallel.
As a result of the French defeat at Dien Bien Phu, Vietnam was divided by 17 parallel.
Thus, the correct answer is Dien Bien Phu.
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