The Fourth Republic by Stirling Newberry
This is a link to a copy of Stirling Newberry's The Fourth Republic, outlining the different constitutional governments of the United States of America, from its founding to ~2001. The current year (2024) falls within the greatly overextended Liberal Democracy, which normally would have ended circa 2000 but has carried on, mostly because the population bulge of the baby boom is still around and in charge (and they're still around because people, on average, live much longer than they used to). The longer it extends itself, the more reactionary it gets, and the 2024 presidential election will decide if we get another four years of it with the possibility of a calamitous end to the cycle, or if we finally start whatever the next cycle may be. An excellent, and highly recommended read .