If you want to do this without having to write a function to recursively generate a query for each node of the tree, you should consider moving to a nested set architecture rather than a parent/child architecture. This allows for getting a node an all descendants with one query. Read this article on the subject for more information: http://www.sitepoint.com/hierarchical-data-database (make sure to read the whole thing.
The good stuff doesn't start until the second page.).
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.