You can set up channels in your Adsense account by signing in, clicking on Adsense Setup (at the top), Channels, URL Channels, +Add New URL Channel.
Once added, all future earnings will be divided into those channels on your main 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.