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Power does not stay in one place. Every few centuries, the axis around which human civilization turns shifts — pulled by conquest, commerce, climate, or the slow grinding of institutional decay. The city that once drew merchants, scholars, diplomats, and armies from every corner of the known world finds itself suddenly peripheral, overtaken, or destroyed. A new center emerges somewhere else, often somewhere that, a generation earlier, would have seemed unlikely.
This pattern has repeated itself throughout recorded history, and arguably before it. What makes a city the center of the world is not simply wealth or military force, though both matter. It is the convergence of functions: the place where ideas are produced and disseminated, where goods flow in and out, where political decisions ripple outward across vast territories, where the most ambitious people go when they want to matter. Cities like that have existed on every inhabited continent. They have risen in river valleys and on coastlines, in deserts and on hilltops. Some were planned. Others grew organically into dominance.
What they share is the experience of centrality — a period when to be there was to be at the edge of everything happening in the world. And what most of them also share is the experience of losing that status. Sometimes the decline was violent and sudden. Baghdad was sacked by the Mongols in 1258 in one of the most catastrophic urban destructions in history. Sometimes it was gradual — Venice spent centuries sliding from imperial maritime power to picturesque tourist destination. Sometimes a city simply stopped being useful to the networks that had once fed it, as happened when overland Silk Road trade collapsed and left Samarkand stranded.
