Can anybody explain why google not approving my adsense account?

Read your own Hub about getting approved. You do not have a site with lots of content. You only have a single Hub.

If you're from india then chances of getting approved with hubpages content only will not be possible. Instead start a forum and post content on it for atleast 1 month then apply to adsense. This way chances of getting approved are higher.

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.