What if I submit 1 article to,say 20 dofollow directories.Will it increase my hub page rank?

Depending on the article directory it is possible. However submitting the article with a different title and bio each time would be wise move. Different directories have different regulations, and you will find that the top article sites, which carry the most weight are the strictest.

All incoming links will benefit your hubscore and will increase traffic. Whilst I do not believe that Hubpages will mark you down for what you have said, Google may penalize you and knock all 20. The best way of increasing your hubscore is to write more quality articles and to participate in the Hub community.

You might end up being flagged for duplicates...

No. It will create duplicate contents in 20 directories. Instead do some minor alterations and add..

It'll not get accepted in second and third time in any directory as many directory submitter checks it for duplicate content. You can use human rewriter or rewriter software to rewrite and then publish copies of article on 20 directories.

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.