

Published in 1997, 'The Fourth Turning' posits that American and Western history moves in predictable 80-to-100-year cycles called 'saecula.' Each saeculum consists of four distinct 20-to-25-year 'turnings'—High, Awakening, Unraveling, and Crisis—driven by the changing attitudes and behaviors of four generational archetypes. The authors famously predicted that the U.S. would enter a 'Fourth Turning' (a period of institutional collapse and rebirth) around 2005, reaching a climax by the mid-2020s. The book argues that historical change is not linear but seasonal, alternating between periods of civic order and spiritual rebellion.
A long human life-cycle (roughly 80–100 years) that encompasses a full cycle of historical seasons. (Source: Wikipedia, Strauss-Howe Theory)
Four recurring types of generations: Prophets (visionary/idealist), Nomads (reactive/pragmatic), Heroes (civic-minded/institutional), and Artists (adaptive/sensitive). Each archetype is shaped by the turning in which they were born. (Source: Goodreads, SuperSummary)
The authors contrast the modern 'linear' view of history as constant progress with the 'cyclical' view of ancient cultures, where history repeats in rhythmic patterns. (Source: SuperSummary)
The idea that a society must undergo a period of total crisis (The Fourth Turning) to clear away old, dysfunctional institutions and build a new civic order. (Source: City Journal)