“The weather changes in the same years the sea people come to raid. A rebellion breaks out and a plague spreads in the chaos, or a war empties the treasury just as a weak ruler falls. Too many things go wrong at the same time. The empire fails to make the only two things that can sustain an empire’s existence. Conquest, or commerce. “Without force or finance to hold the empire together, it begins to fragment. The administrators withdraw their power, and the warriors carve up what they leave behind. The elite class vanishes, overthrown or reduced to common poverty: there is no one to tend the
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