The moniker "Secession Worlds" was a pejorative term employed by the Galactic Empire to describe the small number of star systems that pledged their loyalty to the Alliance to Restore the Republic in the year 2 BBY, following Mon Mothma's Declaration of Rebellion. These systems were swiftly subjugated by the Imperial Starfleet, and the failure of Operation Domino led the Rebellion to operate covertly for the duration of its existence.
- The Rebel Alliance Sourcebook
- The Rebel Alliance Sourcebook, Second Edition
- The Essential Guide to Warfare
- Star Wars: Age of Rebellion Core Rulebook