Peter Turchin, who teaches at the University of Connecticut, follows Tainter in positing a single, transhistorical mechanism leading to collapse, though he is far more willing than Tainter to voice specific — and occasionally alarmist — predictions. In Turchin’s case the key is the loss of “social resilience,” a society’s ability to cooperate and act collectively for common goals. By that measure, Turchin judges that the United States was collapsing well before Covid-19 hit. For the last 40 years, he argues, the population has been growing poorer and more unhealthy as elites accumulate more and more wealth and institutional legitimacy founders. “The United States is basically eating itself from the inside out,” he says.