From: Miami, Florida, U.S.A.
Answer: switch to another empire and try to beat your victorious empire.
For several months, off and on, I’ve been working to add a feature to the Bacon Mod to allow the player to switch to controlling another empire. Unfortunately, I was unable to get it to work. The closest I got was switching empires but when you go to save the game it crashes.
Anyway, I found out there is an easy way to do this without modding. Once you’ve reached the point where you want to switch empires, open the editor and go to “Edit Empires”. Select the one you want to switch to and check the “Playable” checkbox. Save the game and then drop the save file into your “Maps” folder (Create one if you don’t have one). Then start a new game and it should be listed as a playable scenario.
Maybe everyone already knows this and I’m late to the party but I just found out so I thought I’d pass it along.