In the 50s of the last century, the game between the United States and the Soviet Union began, when Vietnam was divided into South Vietnam and North Vietnam, the Soviet Union supported North Vietnam, the United States saw the Soviet Union supporting North Vietnam, immediately intervened to support South Vietnam, in a sense, the Vietnam War is actually a game between the Soviet Union and the United States, it depends on who can win the victory with the support of each side, in the early days it was obvious that North Vietnam had the advantage, South Vietnam did not have any resistance at all, so the United States directly could not see that in 1955 it sent a large number of troops to Vietnam.
This war the United States can be said to be prepared, all of its own pressure box bottom weapons are transported to the battlefield, the United States thought that in the case of equipment crushing, take north Vietnam easily, the result of the United States found itself wrong, North Vietnam not only did not immediately defeat, but spent its own 20 years, in this long period of time, the US military almost atomic bombs are useless, but still did not win, and finally under the pressure of all parties to withdraw their troops.
So the question is, after spending so much time with North Vietnam, the United States has not used atomic bombs for a long time? Is it because the United States has softened its heart? Obviously, this is an impossible thing, Russian experts have also analyzed this problem, he only gave one reason, that is, "the division is unknown", the United States sent troops to the Vietnam War, many countries outside the world opposed, their own citizens and some high-level people also oppose, that is to say, the US military is an aggressive role, in this case, once such lethal weapons are used, then the United States will be strongly condemned by the international community, which is equivalent to committing public anger.
During World War II, Japan and Germany were fascist aggressors, they belonged to the evil side, and the United States was on the side of justice, basically no matter what weapons the United States used, the outside world would not say anything, because at that time, if mankind was peaceful, so after the United States used the atomic bomb, no one condemned the behavior of the United States, and the situation in the Vietnam War happened to be the opposite.
For this reason, the United States did not dare to use the atomic bomb in the Vietnam War, and the consequences of using it were far more terrifying than the loss of 400 billion US dollars, and mankind had long been resistant to the atomic bomb, and if the United States used it again, the result needless to say that everyone knew.