Peter Turchin’s "Ages of Discord" applies Structural-Demographic Theory (SDT) to explain long-term cycles of stability and unrest in United States history. Turchin argues that societies experience "secular cycles" where periods of prosperity are inevitably followed by "disintegrative phases" marked by political violence and state collapse. Central to his analysis are three primary drivers of instability: labor oversupply which leads to popular misery, elite overproduction which fuels intense intra-elite competition, and fiscal distress within the state. By examining data from the 1780s to the present, the author demonstrates how these interrelated trends began to move in a negative direction around the 1970s. Ultimately, the source positions Cliodynamics—the mathematical modeling of historical change—as a vital tool for understanding current American dysfunction and potentially avoiding a catastrophic social breakdown.