Vishaaa - I have had a quick look at some of your hubs and I would say they are little bit short, I would recommend having around 800 words on each hub, so I would add a few more words to each one. I'm not an expert, just my opinion.
I wouldn't know but from what I've heard you can apply as often as you like. If you get rejected, simply write more hubs and try again later. It is good to have a decent number of quality hubs if you are from certain countries yes but I wouldn't know anything about that from personal experience.
Vishaa,You could try using blogger (google owned and free) to publish a blog, then choose the 'monetize' option. They usually approve it much quicker. Then submit the adsense id to HP.
You may even make some additional money of the blog.
Vishaaa,I think you already got your answer. You can apply for adsense account anytime but you should have unique hubs before that. All the best!Ankush.
I applied for AdSense after publishing just one hub and my application was apporoved (I'm in the UK). However, it was seven weeks before my account became 'active' and people's clicks were being logged and rewarded on my AdSense account.
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.