Let's assume that you know how to merge lines when some files are longer than others. Here's a way to make iteration over lines and files easier.
This doesn't give the spare commas you showed in your output, but that wouldn't be hard to add by just popping an extra blank field into data each time we append to it.
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.