I'm setting up a long-term aqua trade circle for the classic population and happiness boosting set-up with bonus resources of fast food, beer & construction, and the wildcards of uranium and fish.
The benefits are:
Uranium allows nations to develop nuclear weapons only if that nations government preference supports nuclear weapons.
If a nations government preference favors nuclear technology for the use of nuclear power plants but does not support nuclear weapons then the nation will receive +$3.00 per citizen and +$0.15 for every level of tech purchased up to level 30 but loses -1 population happiness.
If a nation owns nuclear weapons but does not have uranium the cost to maintain nukes is doubled.
Water increases number of citizens per mile before population unhappiness by 50.
Construction requires technology level of 5 of greater.
Pigs: Tchort
Cattle: Kowalski
Spices: Tchort
Uranium: Surrey Empire
Water: Quelthalas
Wheat: Surrey Empire
Aluminium: Colony 15
Marble: Beersteins
Lumber: Colony 15
Sugar: Kowalski
Fish: Beersteins
Iron: Quelthalas