I'm looking for some kind of background book that outlines the political, military, civil structure of the Empire and Rebel areas etc.
If you played Battletech, back in the day, Fasa used to sell these cool "house" books that told you about everything from military structure to, traditions, to judiciary methods of a given faction. I'd like something similar.
The Star Wars book selection seems so vast that I assume something must have been published in the past (?). I'm looking for more of a reference book than a novel. But if a novel happens to meet requirements please let me know. Appreciate any suggestions.