Is it okay to submit URL to search engines again if content is updated?

I don't see why not. As for the 2nd question, I don't believe so unless you only want people to read one Hub and let them find their way to the other ones if they like what they see.

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.