Although the revolution grew out of economic and political causes, it represents primarily one of those costly and unfortunate internecine wars in which the Nordics have been prone to indulge at intervals for two or three thousand years, and which have done so much to weaken them as a race.
Africa north of the Sahara, from a zoological point of view, is now, and has been since early Tertiary times, a part of Europe. This is true both of animals and of the races of man. The Berbers of north Africa to-day are racially identical with the Spaniards and south Italians.
We see the Nordics again confronted across the Pacific by their immemorial rivals, the Mongols. This will be the final arena of the struggle between these two major divisions of man for world dominance.
Where the environment is too soft and luxurious and no strife is required for survival, not only are weak strains and individuals allowed to survive and encouraged to breed but the strong types also grow fat mentally and physically.