As numerous points of interest have arisen in the course of this essay, I close with a brief summary, to refresh the reader’s mind.
(a) We do not learn from history because our studies are brief and prejudiced.
(b) In a surprising manner, 250 years emerges as the average length of national greatness.
(c) This average has not varied for 3,000 years. Does it represent ten generations?
(d) The stages of the rise and fall of great nations seem to be:
The Age of Pioneers (outburst)(e) Decadence is marked by:
The Age of Conquests
The Age of Commerce
The Age of Affluence
The Age of Intellect
The Age of Decadence.
Defensiveness(f) Decadence is due to:
An influx of foreigners
The Welfare State
A weakening of religion.
Too long a period of wealth and power(g) The life histories of great states are amazingly similar, and are due to internal factors.
Love of money
The loss of a sense of duty.
(h) Their falls are diverse, because they are largely the result of external causes.
(i) History should be taught as the history of the human race, though of course with emphasis on the history of the student’s own country.
No doubt the points Glubb makes are contestable, and unfortunately I'm not in a position to judge his effort. But it is interesting that his list of characteristics which he sees as common to the final age of all empires are rampant across the first world. This is certainly a subject it would be interesting to follow up on. If searching on this subject be sure to include Glubb's name as otherwise you'll be swamped by references to the game The Age of Empires.