Just like Texas was independent and joined the US can a Common Wealth join your civ when you have a govt that can have that many planets.
There are many great features available to you once you register, including:
Sign in or Create Account
Copyright © 2019
Stardock Entertainment. Galactic Civilizations is a registered trademark of Stardock Entertainment.
Steam and the Steam logo are trademarks and/or registered trademarks of Valve Corporation in the U.S. and/or other countries.
Bank Gothic is a trademark of MyFonts and may be registered in certain jurisdictions.
All rights reserved.