The problem is you're trying to pass in a collection of BlogPosts, when a single BlogPost is expected.
I've been working on the same problem, and I think I have a better solution for you. You can loop through the collection and still get this to work.
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.