“Over a period of time (roughly 100 years) a world power emerges from a global war only to experience a gradual decay in its position of preponderance,” writes Thompson. “Global order decays at a parallel rate until a new global war occurs and facilitates the emergence of a new world power.”
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William Strauss,
The Fourth Turning: What the Cycles of History Tell Us About America's Next Rendezvous with Destiny