I wish that the diplomacy screen was more robust. I have read several statements made by the game creators that have argued that the Civilization games were not primarily about war
diplomacy was supposed to be one of the games biggest highlights. In SMAC, if you are allied with one nation, then you create an alliance with another nation, and those two nations go to war, thus threatening your alliance with one of them, then you can negotiate peace between them.
Further, if you engage in a war, and your allies are with you in that war, and you decide that you want to engage in a peace treaty because the other nation surrenders (another cool thing about SMAC), then you can call the other nations off before that nation is completely wiped out.
The whole diplomacy thing in Civilization gets incredibly convoluted, quickly, because if you engage in an alliance then you automatically go to war with another nation because that alliance HAS to be against another nation. If you engage in a mutual protection pact, then you are automatically drawn into wars without the ability to negotiate a peace when a war breaks out that you dont really want to be in, and which can cause you to go to war with nations you have other sorts of trade agreements with, etc. This became very frustrating when I had a mutual protection pact with the Russians and had a right of passage agreement with the Greeks. I automatically was drawn into a war with the Greeks who refused to even speak to me for many turns in the game, and then when all was done, would not engage in other agreements with me because I had been forced to break the right of passage agreement and "attack them"which I didnt even do. I find the diplomacy screen to be far less than it could be, one that limits the player in crucial ways that lead to ultimately NOT knowing who ones allies are, and limiting the ability to engage in options that are more economic rather than militaristic. How difficult would it have been to have included such options in the diplomacy screens?
Further, why is it that the player does not have more control over trade embargos? I mean, the player should be able to engage in an embargo and then cease that embargo when it wishes to do so. If I can give money to another nation even while I have a trade embargo against them, or even turn over a city, then why cant I end a trade embargo when I wish? In addition, why cant we give units to other nations like in Civ II? I engaged in a trade embargo in 1800 that I could not seem to turn off until 1916. There were no lines in the screen with all the pictures of the other civ leaders that indicated that I had a trade embargo still in effect, other nations kept asking me to engage in a trade embargo against the nation even though in the Trade screen I was told for 116 years of the game that I had a trade embargo against the nation and the resources I wanted to trade with the nation were grayed out. I will not engage in another embargo, thats for sure, as it totally ruined the game that it went on for so long and I had absolutely NO control over canceling it and the game just forgot about it. This is the same for alliances or mutual protection pacts. Why am I forced to go to war with a nation just to cancel a pact? For example, I was engaged in a mutual protection pact with the Russians who then turned around and practically declared war on all the other civs. This completely screwed up my whole diplomatic plan, but there was no way to cancel my mutual protection pact that was resulting in my being drawn into war with the rest of the planet without also going to war with Russia. Ridiculous.