With respect to the Vietnam war, what is the historical significance of Kai-San (spelling?) or Battle of Kai-San? Thanks?

I think you mean the Battle of Khe Sanh (1968), in which the North Vietnamese army surrounded a marine unit. The head of the NVA, General Giap, had originally masterminded the French defeat in Dien Bien Phu in 1954, and was also behind the Tet Offensive. With the marines surrounded, it looked like he could be responsible for yet another military disaster for Western troops in Vietnam.

President Johnson responded by reinforcing the marines in Khe San with fresh troops brought in directly from the US and by bombing the tunnels with which the NVA were approaching the American base (part of Operation Niagara). Eventually, the siege was lifted. One question surrounding Khe Sanh is why the Vietnamese spent so much effort there in the first place, rather than redirecting their troops to the Tet Offensive, thereby ensuring its success?

Had Khe Sanh not taken place, and the Tet Offensive been successful, the war in Vietnam would likely have ended much earlier.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.