Atahualpa
Chieftain
With the unit changes in Civ5 I thought a little also about how wars build up in our world. In Civilization up until now it was always basically a totally unforseeable action, especially for the AI. The human player could be pretty sure that a Friendly civ didn't attempt an attack. In reality however, I doubt the number of surprise attacks is as high as in Civilization.
Also in democracies declaring war is never an easy thing. The people in many ways also have to support this given their sentiment towards the other nation. In Civilization 4 two totally friendly civs, there's no prevention that they declare war against each other.
To me it seems plausible that the relationship would need to cool down before a war can be opened. Or there could be a severe disadvantage when performing a sneak attack.
Also in democracies declaring war is never an easy thing. The people in many ways also have to support this given their sentiment towards the other nation. In Civilization 4 two totally friendly civs, there's no prevention that they declare war against each other.
To me it seems plausible that the relationship would need to cool down before a war can be opened. Or there could be a severe disadvantage when performing a sneak attack.