Fourth Turnings are critical thresholds for national survival. Each of the last three American Crises produced moments of extreme danger: In the Revolution, the very birth of the republic hung by a thread in more than one battle. In the Civil War, the union barely survived a four-year slaughter that in its own time was regarded as the most lethal war in history. In World War II, the nation destroyed an enemy of democracy that for a time was winning; had the enemy won, America might have itself been destroyed. In all likelihood, the next Crisis will present the nation with a threat and a
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