This may be partially off-topic, but how does the AI decide which government to use?
I've noticed that in Conquests, late in the game, a lot of AI opponents use Fascism, most of the rest will use Democracy. I saw a lot of Communism in PTW, but I rarely see it in Conquests.
It's been my assumption that when an AI opponent acquires a new government "technology," there is a certain percent chance it will adopt the new government. Possibly influenced by factors of whether that opponent is at war or peace, or some sort of preference based on civilization abilities.
If I'm right, that would explain why a lot of AI opponents end up with Fascism- it's usually the last government "technology" acquired, so thus would be the last time a civilization considered "should I switch to the new government form?" Plus, late in the game, every AI opponent has had a good opportunity to get into one of those never-ending wars with another opponent at whom it has become perpetually furious. It could also explain why Democracy is the second most popular late in the game (since Democracy is usually obtained after Communism; it is the second-to last chance for an AI to ask, "Should I switch to this government?")
Edit: I am wrong about my where I thought I remembered the different governments being on the research tree. Democracy is usually going to come first (late medieval era), with Fascism and Communism both being availabe early in the industrial era, each as one step beyond Nationalism.