What is with being the most pwerful nation, leading in points, nearly completed with the spaceship and getting attacked by a neighbor who was pleased the turn before? Catherine has lost 60-70 units to my 15-20 and has made no progress. I can understand if A) the AI country had a tech advantage or B) was more powerful or C) was annoyed/furious with me. But after 3000+ yrs of peace and trade with a pleased posture? BTW this game is a normal / epic / inland sea / Noble.

I have found Defensive Pacts more useful in Civ4 than in Civ3 for deterring Civs from declaring war on you.