Page views or ad impressions don't automatically equate to advertisement clicks. Are you purposely writing with the goal of earning?
There's a ton of advice on this site on writing for earnings.
Only reason for no google ads may be non-acceptance of your application for publishership by google. You can verify it from your affiliate account. If status is active it means google ads are being displayed on your hubs.
You may find ads being displayed on your hubs even if you don't have an adsense account. These ads are being displayed for hubpage for its share or for the hubber under whom you have signed. You are here for 12 months and have only 7500 hits.
Usually it takes 3-4 months for most of the hubbers to have some income from hubpages. With 7500 hits, you may expect 70-75 clicks and your share of clicks should be 40-45. Have patience and try to improve your hub traffic and your hubber score though hubber score is in no way connected with your income.As per google's policy, publishers can not disclose their income, nor they can openly discuss about other parameters like eCPM etc. That could be the reason for removal of your question alongwith answers.
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.