As a people become more wealthy, they don't need to work as much to sustain themselves, and can choose to spend more time either to play sports or enjoy leisure. Some people will continue to work more than necessary, so the correlation is imperfect.
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.