New combinations will rise to prominence, Glubb predicts:
We have traced the rise of an obscure race to fame, through the stages of conquest, commercialism, affluence, and intellectualism, to disintegration, decadence and despair. We suggested that the dominant race at any given time imparts its leading characteristics to the world around, being in due course succeeded by another empire. By this means, we speculated, many successive races succeeded one another as superpowers, and in turn bequeathed their peculiar qualities to mankind at large.
But the objection may here be raised that some day the time will come when all the races of the world will in turn have enjoyed their period of domination and have collapsed again in decadence. When the whole human race has reached the stage of decadence, where will new energetic conquering races be found?
The answer is at first partially obscured by our modern habit of dividing the human race into nations, which we seem to regard as water-tight compartments, an error responsible for innumerable misunderstandings.
In earlier times, warlike nomadic nations invaded the territories of decadent peoples and settled there. In due course, they intermarried with the local population and a new race resulted, though it sometimes retained an old name. The barbarian invasions of the Roman Empire probably provide the example best known today in the West. Others were the Arab conquests of Spain, North Africa and Persia, the Turkish conquests of the Ottoman Empire, or even the Norman Conquest of England.
In all such cases, the conquered countries were originally fully inhabited and the invaders were armies, which ultimately settled down and married, and produced new races.
In our times, there are few nomadic conquerors left in the world, who could invade more settled countries bringing their tents and flocks with them. But ease of travel has resulted in an equal, or probably an even greater, intermixture of populations. The extreme bitterness of modern internal political struggles produces a constant flow of migrants from their native countries to others, where the social institutions suit them better.
The vicissitudes of trade and business similarly result in many persons moving to other countries, at first intending to return, but ultimately settling down in their new countries.
The population of Britain has been constantly changing, particularly in the last sixty years, owing to the influx of immigrants from Europe, Asia and Africa, and the exit of British citizens to the Dominions and the United States. The latter is, of course, the most obvious example of the constant rise of new nations, and of the transformation of the ethnic content of old nations through this modern nomadism.