1633 is an alternate history novel co-written by American authors Eric Flint and David Weber published in 2002, and sequel to 1632 in the 1632 series. 1633 is the second major novel in the series and together with the anthology Ring of Fire, the two sequels begin the series hallmarks of being a shared universe with collaborative writing being very common, as well as one that, far more unusually, mixes many canonical anthologies with its works of novel length. That is because Flint wrote 1632 as a stand-alone novel, though with enough "story hooks" for an eventual sequel, and because Flint feels "history is messy" and the books reflect that real life is not a smooth, polished linear narrative flow from the pen of some historian but is instead clumps of semi-related or unrelated happenings that somehow sum up how different people act in their own self-interests. Premise The series begins in the Modern era on May 31, 2000, during a small town wedding when the small West Virginia town of Grantville trades places in both time and geographic location with a nearly unpopulated countryside region within the Holy Roman Empire during the convulsions of the Thirty Years' War. Flint's goal was to explore the short- and long-term effects of placing a single American town, complete with modern culture, technology and modes of thought, in certain periods of history. The town elects the charismatic former pro-boxer Mike Stearns as president, and he quickly decides to provide refuge for those displaced as a result of the constant fighting, to branch out and grow as quickly as possible—to launch the American Revolution "150 years early", and found a "New United States". The Grantvillers undertake to defend south central Thuringia with the aid of a cavalry detachment from king Gustavus Adolphus of Sweden's Green Regiment, and fights several battles which convince various polities to join the NUS. By early 1632, their informal alliance with Gustavus and with Jews, their manufacturing capabilities, and their defeats of Catholic armies draws serious and well-designed concerted efforts to attack the "republican cancer" growing in Thuringia, and Grantville itself is attacked, teaching Stearns that he needs a protector to "buy time", even as the "up-timers" have determined that to retain as much technology as possible they need to "gear down" to a late nineteenth-century technology base while their modern equipment is still operable. Plot summary 1633 continues where