Where, in the ruleset files, is defined whether a trade route can be established here?

[actionenabler_traderoute]
    action = "Establish Trade Route"
    actor_reqs    =
        { "type",   "name", "range", "present"
          "UnitFlag", "TradeRoute", "Local", TRUE
        }

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How do you establish Trade Routes in Civ 5?

Once you have an appropriate Trade unit in the city you want it, you can proceed to establish Trade Routes between cities. Note that Trade Routes can be established only along the native terrain of the unit (land tiles for a Caravan, Water tiles for a Cargo ship), and with cities in range of the current unit's base.

How do you establish Trade Routes in Civ 6?

After researching the civic Foreign Trade, you gain the ability to create Traders. Traders can start a route from the city they are currently in. Once you have built a trader and the trader is selected, you can see an action in the unit panel with the icon of a trade route (two arrows in a circle).

How do you send Trade Routes to city states Civ 6?

International tradeTrade Routes with city-states. They work much the same as routes with other civilizations (without the extra social effects, of course).

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Stellaris - Trade Route Mechanics (The Spice Must Flow)

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