Even savage and militaristic empires promoted commerce, whether or not they intended to do so. The Mongols were some of the most brutal military conquerors in history, massacring the entire populations of cities. Yet, in the thirteenth century, when their empire extended from Peking to Hungary, the caravan trade between China and Europe achieved a remarkable degree of prosperity—the whole journey was in the territory of one government. No such conception ever appears to have entered into the minds of our historians. In general, historical teaching in schools is limited to this small island. We endlessly mull over the Tudors and the Stewarts, the Battle of Crecy, and Guy Fawkes. Perhaps this narrowness is due to our examination system, which necessitates the careful definition of a syllabus which all children must observe. Men can scarcely be blamed for not learning from the history they are taught. There is nothing to learn from it, because it is not true. XXXVI Small nations

The Roman Republic, as we have seen, was followed by the empire, which became a super-state, in which all the natives of the Mediterranean basin, regardless of race, possessed equal rights. The name of Rome, originally a city-state, passed from it to an equalitarian international empire.Writing in The Reporter, Ray Alan commented that the book was more than just an apologia; while it provided "no serious political analysis or social observation", it did offer interesting insights into the period, even if Glubb was out of touch with later trends in Middle Eastern politics. What Alan found more surprising was that Glubb also had hardly anything new to say about the 1948 Palestine war "in which he had star billing," instead lapsing into self-justifying propaganda. Alan ends his review with a long quotation from T. E. Lawrence, in which he reflects on what role a foreigner may play, and prays to God that "men will not, for love of the glamour of strangeness, go out to prostitute themselves and their talents in serving another race", but will let them "take what action or reaction they please from [his] silent example". [24] The Age of Commerce is also marked by great enterprise in the exploration for new forms of wealth. Daring initiative is shown in the search for profitable enterprises in far corners of the earth, perpetuating to some degree the adventurous courage of the Age of Conquests. XIII The Age of Affluence In fact, the modern nations of the West have derived only limited value from their historical studies, because they have never made them big enough. For history to have meaning, as we have already stated, it must be the history of the human race. But when individual members of such a society emigrate into entirely new surroun- dings, they do not remain conspicuously decadent, pessimistic or immoral among the inhabitants of their new homeland. Once enabled to break away from their old channels of thought, and after a short period of readjustment, they become normal citizens of their adopted countries. Some of them, in the second and third generations, may attain pre-eminence and leadership in their new communities.

With Henry Field) The Yezidis, Sulubba, and Other Tribes of Iraq and Adjacent Regions, G. Banta, 1943. the extraordinary exactitude with which these stages have followed one another, in empire after empire, over centuries or even millennia; and It is of interest to note that decadence is the disintegration of a system, not of its individual members. The habits of the members of the community have been corrupted by the enjoyment of too much money and too much power for too long a period. The result has been, in the framework of their national life, to make them selfish and idle. A community of selfish and idle people declines, internal quarrels develop in the division of its dwindling wealth, and pessimism follows, which some of them endeavour to drown in sensuality or frivolity. In their own surroundings, they are unable to redirect their thoughts and their energies into new channels. The conquest of vast areas of land and their subjection to one government automatically acts as a stimulant to com- merce. Both merchants and goods can be exchanged over considerable distances. Moreover, if the empire be an extensive one, it will include a great variety of climates, producing extremely varied products, which the different areas will wish to exchange with one another. The division of Rome into two periods may be thought unwarranted. The first, or republican, period dates from the time when Rome became the mistress of Italy, and ends with the accession of Augustus. The imperial period extends from the accession of Augustus to the death of Marcus Aurelius. It is true that the empire survived nominally for more than a century after this date, but it did so in constant confusion, rebellions, civil wars and barbarian invasions.It is unnecessary to labour the point, which we may attempt to summarise briefly. Any regime which attains great wealth and power seems with remarkable regularity to decay and fall apart in some ten generations. The ultimate fate of its component parts, however, does not depend on its internal nature, but on the other organisations which appear at the time of its collapse and succeed in devouring its heritage. Thus the lives of great powers are surprisingly uniform, but the results of their falls are completely diverse. XXXV Inadequacy of our historical studies