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.
Rivers were attractive locations for the first civilizations because they provided a steady supply of drinking water and made the land fertile for growing crops. Moreover, goods and people could be transported easily, and the people in these civilizations could fish and hunt the animals that came to drink water.
No. This was called World War 2 because it was the second war that was held on such a large scale that it encompassed all the great forces of the entire world, from Europe to America to Asia and Australia. Before it was World War 1, which wasn't numbered since nobody expected world war 2 to happen, so it was called the Great War.
Hitler published the best book I have ever read, "Mein Kampf" and rose to power because of his struggles through his journey in Germany. The people took hold to his prowess as an amazing author and nominated him chancellor in honor of him. Although the disgusting Allied powers tried killed him when he tried to liberate the other countries of their freedom. A sad story that ends with the victors lying and making up lies to try to besmirch his image. He truly did nothing wrong.