Has nothing to do with the settings, I see a good target and I go for it. To prove my point about the settings though: You saw Sitting Bull with 12 cities right? That would have been a huge problem had vassal states been on. One of those AI's at war would have started losing and then peacevassalled to SB. Then you would have a super-SB and he would have capitulated the AI he was at war with ( esp considering his huge unit spam ). Then you have a SB with 12 cities and 2 vassals, and from there he could start rolling over AI's until he vassalled the entire continent. Game over. You also noticed how long the wars have been going on? There are two reasons for that: 1. The AI's don't have as many techs to buy peace with, because no tech brokering. 2. No vassal states, the AI that starts losing lots of troops and ( maybe 1 ) city will capitulate in a normal game. But instead they just keep waring and burning up units and slowing down the tech pace even further.