Very rarely. Unless you go into teaching, science, engineering or possibly programming, you are unlikely to use any mathematics you studied after the age of 9. I was an electronic engineer for 20 years and the hardest actual mathematics I used in my career was twice I needed to solve a quadratic (learned at age 14).
That is twice in 20 years. The rest of the time it all comes down to arithmetic.
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.