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The Strauss–Howe generational theory, created by authors William Strauss and Neil Howe, identifies a recurring generational cycle in American history. Strauss and Howe lay the groundwork for the theory in their 1991 book Generations, which retells the history of America as a series of generational biographies going back to 1584. In their 1997 book The Fourth Turning, the authors expanded the theory to focus on a fourfold cycle of generational types and recurring mood eras in American history. They and their consultancy, LifeCourse Associates, has expanded on the concept in a variety of publications since then.