TopN sets the number of url to be fetched in every depth. In your first example depth is 3. Depth1 is seed url.
And in depth2 and depth3, 5(topN value) urls will be fetched. 5*2 (depth2 and depth3) + 1 (seed url i. E depth1) = 11.
TO fetch more urls you can increase topN. If you do not want to restrict then you can skip topN argument.
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.