Think of a Hub as an article in your favourite magazine or newspaper.
Definately write what you know at teh beginning, but also be willing to branch out. That mix of passion and curiousty will be wha is needed to create a great hub.
I would just write about what is truly on your mind. An honest hub is one that will truly help or reach out to people. Write about what you have knowledge about.
This knowledge may help someone who doesn't contain the knowledge that you do! I am very new to writing hubs, but I love to write them! My honest answer would be to write about what you are passionate about.
Write with knowledge, meaning, and real feelings.
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.