Historically, Rome had to import "Corn" (more properly, various grains) from Sicily and Egypt, especially in the Late Republic and most of the Empire. I understand Cities in Elemental will have trade and bring in resources, but will they be able to do so from other Kingdoms/Empires? If so, does such trade require both sides to accept, or is "Black Market" trading possible? Does war between two Kingdoms/Empires automatically cause all trade to cease?
I think it'd be neat to allow trade to continue, sometimes against the will of one ruler or another, perhaps depending on the oppression level.
