The artillery we have are doing the job fairly well, but Spain only had Riflemen and didn't have any cities above size 12- right now only Korea and Sumeria seem to have built any hospitals, but the other AI's might eventually build up some larger cities.
Korea's the only civ I've seen with Infantry so far, but I think most of the other AI's can build them.
The only resources I can currently sell are Horses and Salt to America and Coal and Rubber to Egypt.
From what I can tell from resources everyone has in their territory:
-Sumeria has everything but Rubber, and we're exporting them Rubber
-Korea has Saltpeter, Oil, and Iron, and are getting Horses and Rubber from us
-Portugal has everything but Saltpeter, though their only source of Horses is in an isolated city on the other side of Egypt, not sure whether they have it hooked up or not
-Egypt has Oil, Saltpeter, and Horses
-America has Iron, Coal, and Rubber in their territory, but might not have them all hooked up
-The currently active AI trade routes are between Portugal and America, Portugal and Korea, America and Korea, Sumeria and Korea, and Sumeria and Egypt. We can say for sure that the Sumeria-Egypt trade route must be Sumeria exporting Egypt their spare Iron, I'm pretty sure Korea must be getting Coal from Portugal since no other AI has more than one source of it, while Portugal must be getting their Saltpeter from Korea because America has none, and must also have that far-off source hooked up if they have Horses.