Gregory Cochran: Theory and evidence. Theory says that humans would be less fitted to a new way of life, and that genetic changes that made the fit better would spread. It also says a greatly increased population would result in more of the rare mutations that cause such favored changes.
We have lots of evidence of recent change, evidence of several kinds. We find unshuffled regions of the genome that have apparently increased in frequency recently (over the past few thousand years). We're just starting to look at ancient DNA, the genes of people who died thousands of years ago, and we see differences from the present.
Of course we can look at their bones as well, and they look different -- human skulls have changed quite noticeably in the last 10,000 years, more among some groups than others. Along that line, we know of many other differences in phenotypes (bodies) that we don't yet understand the genetic underpinnings of. We know quite a bit about measureable differences involving ... 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.