First consider that you're allowed to do that on eHow.com or not. I guess you couldn't do that in the way you explained here.
A web crawler is just a wrapper around a parser (like SimpleHTMLDOM) for automatically fetching pages by following links.
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.