i dont know, i cant get those pesky AI to agree to any treaties. Heck, i can barely get them to agree to regular treaties. i really wanted to experiment with alliances, too.
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...the green, sticky spawn of the stars
(with apologies to H.P.L.)
We could experiment with alliances by having two human-controlled empires. When starting a new game, just add two new empires to have a 2-player hotseat game.