Board Thread:General Discussion/@comment-119.12.11.69-20130309010901/@comment-4544033-20130309013240

After giving the Crown to one of the leaders, you are unable to switch sides.

Also, on a side note, while the empire is conected to the Dominion, that dosnt mean they are allys, both sides imply very offten that there will be war again. That being said, a united empire is stronger and will be better maned for round two.