If someone was mixed with all these ethnicities how do you think they will look like?

There's no such thing as "mixed with ethnicities" There are a few exceptions, but in general either you speak the language or you are not part of the ethnicity.

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.