Okay, let’s put aside the fact that war doesn’t really make much sense in real life. We’re talking about games, here. This is a gaming blog.
I’m not a historian by any means, but I don’t think I need to be one to tell that something’s a bit off when one of the CPU-controlled players, with whom I’ve had very little contact, declares war on me even though I’m not controlling an important resource, blocking some strategic position, or otherwise being much of a threat. Potentially, I could turn this into a long rant on why AI in 4X games can be so lacking, but I don’t think that’s the actual problem, here.