Steve Sailer wrote: "There is tentative evidence for evolution of more defenses against influenza -- in general, blacks had a hard time surviving in the North due to respiratory tract infections, which is one reason slavery faded out in the North, which [is] something they ought to teach you when you study the Civil War."
C. Aubrey commented: "Two reasons they will never teach it: 1) it suggests that blacks are physically different in some way - their inability to handle respiratory viruses; 2) it suggests that Yankees didn't reject slavery simply because they were moral giants."
There is more and more evidence that things we think that are important, such as morals, ethics, etc. exert almost no impact on human affairs. Unseen factors like genetic disease resistance decide the fate of wars and of races. The New World was conquered by a handful of Spanish military entrepreneurs only because they had resistance to epidemic diseases. Ashkenazi Jews accumulate more capital than other people, in part, because we have less diseases and in average live longer. No need for moral or conspiratorial theories.