How does a Hub become a "Featured Article"?

No idea. I guess it's done using keywords, or maybe the HubPages staff decide? They made a podcast about one of mine recently and put it on the HubPages blog, which was flattering.

I think they are trying to promote more factual and informative hubs at the moment after the google algo changes.

It is something that is decided by Moderators and/or HubPages staff, I'm certain. It could come as a Featured Article or a Featured Hubber. :).

If the hub contains quality writing and excellent background the Hubpages Team will select among the writings of the day, They will the one who choice what is the featured Article of the Day....

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.