北方人種
Grant argued the Nordic race had been responsible for most of humanity's great achievements (he lists Dante, Raphael, Titian, Michelangelo, and Leonardo da Vinci as examples of Nordics). Admixture was "race suicide" and unless eugenic policies were enacted, the Nordic race would be supplanted by inferior races. Future president Calvin Coolidge agreed, stating "Biological laws tell us that certain divergent people will not mix or blend. The Nordics propagate themselves successfully. With other races, the outcome shows deterioration on both sides." Grant argues that Nordics founded the United States and the English "language", and formed the ruling classes of ancient Greece and Rome. An analysis performed by Grant alleges that Northwestern Europeans are less criminal than Southern and Eastern Europeans (see also Race and crime).