PS-1 is a world that asks "Where would famous people be in a parallel universe?" and all else follows.
Multiple PODs all combined into one timeline that tries to make sense of it all. The AlternateHistory.com thread this timeline is based on is here: http://alternatehistory.net/discussion/showthread.php?t=109543. Its POD is the election of Benedict Arnold (who stayed with the Americans) rather than George Washington in 1789.