Why don't different human ethnicities have more drastic physiological differences, like pronounced forehead ridges or fangs?

Because we are all the same species, despite our ethnicities, and our DNA is so similar that there aren't many pronounced differences between us, aside from color, bone structure, and other much more subtle characteristics. More.

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.