Your add method is wrong. You're taking the root node and setting its next value to the new node. So you will never have any more than 2 nodes.
And if you ever have 0, it will probably crash due to a null pointer.
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.