There are three (four) alternative possibilities.
This is a common use for hierarchical, or tree-structure data. I wrote a popular answer to this Stack Overflow question: What is the most efficient/elegant way to parse a flat table into a tree?
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.