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In my experience, the modify reputation event doesn't work when you try to improve a civ's rep, only when you want to make it worse. The Eiffel Tower does, and the UN wonder can be used to force a civ to make peace, but not an alliance.
You can start 2 civs already in an alliance and prevent them from talking, then use the Negotiator event to allow communication at a certain point. Then if the alliance has been in existence for any length of time, it will likely end.
You can also do this in reverse, by setting the civs at war, and being unable to talk, cannot make peace until the Negotiator event is triggered. This is what I did in Frederick the Great. Both schemes can be screwed up if the AI has diplomatic units.
You might be able to manipulate the AI to form an alliance. When faced with a very powerful civ, the 2nd and 3rd strongest civs will often make an alliance.
Unfortunately, I do not know how to force an alliance between 2 previously unallied civs, short of some sort of built-in hex editor program thingy. Maybe someday.
You can start 2 civs already in an alliance and prevent them from talking, then use the Negotiator event to allow communication at a certain point. Then if the alliance has been in existence for any length of time, it will likely end.
You can also do this in reverse, by setting the civs at war, and being unable to talk, cannot make peace until the Negotiator event is triggered. This is what I did in Frederick the Great. Both schemes can be screwed up if the AI has diplomatic units.
You might be able to manipulate the AI to form an alliance. When faced with a very powerful civ, the 2nd and 3rd strongest civs will often make an alliance.
Unfortunately, I do not know how to force an alliance between 2 previously unallied civs, short of some sort of built-in hex editor program thingy. Maybe someday.
[/desperately trying to remain as mysterious as possible]
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