Yeah well if this is a real question (instead of a prompt from some guided supervisor), i can give some direction.
Check the word "imperialism" should lead you to colonies which relates directly to submission and exploitation.
Here come those Euro-civilized nations specifically French when talking of Vietnam.
The Vietnamese chose selfguided revolution under the Communist flag (when the United States chose not to support), them.
The Vietnamese fought against Japanese aggression during WW 2 and when France tried reinserting itself they stepped forward and refused the French aggression/colinization efforts. The latter included UN manipulation by Euro dominance.
When the country of Vietnam was split in two with the United States assuming the French position in the south the Vietnam War escalated.
After some ten years and some fifty plus thousand deaths on the american side the same result occured the United States of America was defeated and the country of Vietnam was finally free of foreign dominance.
It must be pointed out that Chinese and Russian interference was also deflected during this time. The Chinese have also through several generations tried to assert influence but to limited effect.
So when did the "Vietnam War" start be sure of the parameters of when you are speaking.

The U.S. was asked by France to keep the communists from "taking over" the French Territory. We sent troops over only to advise, and from there on... America was already in it and it just went down hill from there. We lost more people in this war over an agreement.

1) Rubber - Michelin (French) - Goodyear and Firestone responding to demand for industrialization of automobile manufacturing and hence, tires.

2) Heroin