I understand that our hubs are supposed to be evergreen?

This means your articles should stand the test of time. If you write about Chinese New Year 2011 (that was only a few days ago) then your article will not be relevant anymore in the future. But things like recipes, saving money or home decoration are evergreen because that content is still interesting in many years from now.

You can write about birthdays for a child and if it is done well then it is still evergreen. Many people have children and each year there is a birthday for them. So a hub about what to do on a child's birthday is definitely evergreen because even many years from now people will want to read that article.

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.