The Lovely bones" It is sad but it's also a beautiful movie.
Can't think of the saddest one, but "Central do Brasil" from 1998 had one of the strongest emotional scenes I've ever seen. Other than that I'm thinking Roberto Benigni's "Life is Beautiful", "The Pursuit of Happiness" with Will Smith and his son + "Million Dollar Baby" at the end. Did I say "The Green Mile"?
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.