The United States first began developing nuclear weapons in 1939, during World War II, under the order of President Franklin Roosevelt. Motivation was the fear that US was engaged in a race with Nazi Germany to develop nuclear weapon. This project is best known as Manhattan Project.
It is like Nixon said, "no event in American history is more misunderstood than the Vietnam War." I can't give a clear answer but I do have some food for thought which may paint a big picture.
1. You have to keep in mind that Vietnam was not about who killed more troops.
If the winner of the Vietnam war was declared by who killed more troops than the U.S. would win hands down. The U.S. casualties were roughly half a million, where as the Vietcong suffered a little more than a million. Then how did we lose?
2. Keep in mind that at this time technology has improved and Vietnam is the first war where people are watching it go on right at home on there television screen.
They are seeing their sons being shot and viewing dead soldiers every single day.
You did not see this in WW1 or WW2 or the Korena War.
The correct answer is linear perspective
Linear perspective is the method that represents the three dimensions of space on a flat surface. It is a geometric system that creates the illusion of depth. Knowing that parallel lines are always on the horizon, perspective mimics the depth of the painting.
Some characteristics of the Aryan culture were that it was patriarchal
meaning that the father was the head of the household. They were also
polytheistic in that they worshipped many gods whose wives were
unfaithful. They are also said to be nomadic with some living more by
hunting while others raised livestock.