No disrespect intended, but I've sent my diplomats to different cities within the same faction after establishing trade, and have been bluntly told that a trade agreement already exists. I've also established trade and other agreements simply through their diplomats and army commanders, without ever visiting their cities. That part I really like, 'cause the AI has more brain cells to devote to pushing diplomats around the map.HOWEVER what I think I'm seeing is you can only trade with cities that you know about by you visiting, or perhaps you buying the map information from another faction.
On another trade point, an unfriendly army (enemy/rebels) doesn't seem to alter the situation much if they're sitting on your roads. The little wagons keep slipping beneath their feet. Anyone know for sure?
And as far as ports go, you need one to trade by sea, though it has no bearing on land-based trade. I don't know if the city you're trading with must also have a port, but that may be true. I've been unable to trade by sea with some factions, Britain for example, that I had agreements with, and the reason may be the existance of fishing villages and not ports. Must check that out.
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