Everybody is mixed, that's the whole point of sexual reproduction. There are no genes for ethnicity or nationality, and percentages do not apply. You get 23 chromosomes of either parent - not 11 and a half from any grandparent.
You either have a nationality ("passport") or you don't You either have a native language (ethnicity) or you don't It's perfectly possible to have more than one.
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.