CMake should be rerun anytime any of the cmake files is modified or if you would like to change the build option from Release (optimized code) to Debug or vice-versa. Furthermore, CMake should be rerun anytime you add/remove/rename header and source files. More.
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.