Three Men Who Never Met
A Maghrebi judge, a British general and two American demographers, six centuries apart, agreeing on a mechanism. Each can be dismissed by provenance. Not all three at once.
Three men who never met, separated by six centuries, working in different civilisations, in different languages, with different methods and opposite religious commitments, arrived at the same conclusion about how civilisations end.
That is the strongest thing in this book, and it is structural rather than rhetorical, so it survives disagreement with almost everything else.
Ibn Khaldun, a fourteenth-century Maghrebi judge, working from the collapse of North African dynasties he had watched personally. His mechanism is asabiyyah: cohesion, generated by hardship, dissolved by the comfort that cohesion earns. Five generations from founding to ruin.
Sir John Glubb, a twentieth-century British soldier with thirty-six years in the Middle East, working from eleven empires across three thousand years. His finding is a lifespan of roughly 250 years and seven stages in fixed order, ending in decadence.
Strauss and Howe, American writers in the 1990s, working from five centuries of Anglo-American social data. Their finding is an eighty-year cycle in four turnings, ending in crisis.
Different inputs. Different units of analysis. One of them a Muslim scholar, one an imperial officer who had spent his career administering the thing he was diagnosing, two secular Americans with spreadsheets.
They agree. Not in atmosphere, in mechanism: that success erodes the conditions that produced it, that the erosion follows an order, and that the order is legible enough to place yourself within it.