Maybe it's just me, but it seems like getting military alliances is too easy--often AI civs will flatly refuse to trade me tech or resources, but will happily invade at my behest nearer and far more powerful civilizations for a few hundred gold (the equivalent would be Al-Qaeda convincing Canada to invade the U.S. on the promise of a few million bucks!). This is nice when I need some help, but it's also quite annoying when the AI teams up with each other.
In my current game, I played as a friendly tech-trader & had Polite relations with each of the ten other civilizations in the game all the way up to 1870 A.D.--not a single war or diplomatic transgression on my part. Then I told a foreign unit that had trespassed into my territory to leave (like I'd done many times before) and that civ immediately declared war on me--over the next few turns, a cascading alliance led to 9 of the 10 civs declaring war on poor, peaceful little old me (I think I'll be able to hold out for a couple of decades before getting wiped out)! I guess what I'm saying is that it seems odd there's no way to really build up goodwill over time or to ensure peace other than with a mutual protection pact (which will likely get you drawn into wars with other civs).
In my current game, I played as a friendly tech-trader & had Polite relations with each of the ten other civilizations in the game all the way up to 1870 A.D.--not a single war or diplomatic transgression on my part. Then I told a foreign unit that had trespassed into my territory to leave (like I'd done many times before) and that civ immediately declared war on me--over the next few turns, a cascading alliance led to 9 of the 10 civs declaring war on poor, peaceful little old me (I think I'll be able to hold out for a couple of decades before getting wiped out)! I guess what I'm saying is that it seems odd there's no way to really build up goodwill over time or to ensure peace other than with a mutual protection pact (which will likely get you drawn into wars with other civs).


In my past wars, the AI has never been that aggressive against me and we usually end up making peace after 5 to 10 turns, so I didn't want to join a bunch of military alliances only to make those civs mad by making a peace treaty while they were still at war. In other words, I haven't managed to figure out yet when a random war against some distant civ will be a petty annoyance of a few units occasionally landing or the lead-up to a massive world war. 