What are trade networks and how do they work?
A trade network is the interlinking of your cities to each other, as well as linking your capital city to foreign capitals. By doing so, you will be able to trade resources from your civilization to another and vice versa (since trading resources requires two capitals to be connected by land or water) and thus allow your domestic cities that are connected to your capital to make use of that resource as well. The ways to connect cities to one another include by road (building a road between the two cities) or by water (having two cities connected by either a river, coastal tiles in your own or neutral territory provided you have Sailing, or ocean tiles in your territory (or in neutral territory, but that also requires Astronomy)). All cities do not need to be connected to every other city – they just need to be linked to one, which is linked to another, and so on. You can also have trade networks using all the different kinds of connectors. Cities that are connected to your trade networ
