In your code I can't see it, but it looks like there's a member variable containing a Gson possibly indirectly (It can be even an anonymous class instance capturing it). AFAIK, the exception says that Gson is not Serializable which is OK since you most probably don't want to store it anyway.
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.