In the first place, a prolonged struggle in the North Temperate Zone, with a harsh, though not a depressing, natural environment, endows the Teuton with unusual energy and initiative. Then centuries of wanderings in which the strong set forth and the weak and timid stay behind, brings the Teuton to the west of Europe, to the British Isles, and to America, with a courage, enterprise, and self-assertion rare in the history of man. The Teuton becomes the Anglo-Saxon, and therewith less apt for the gregarious life.