I was reading an article (I lost the page due to Internet failure and don't have the link) on world building and it was talking about in depth world building, the article begins by talking about network theory and states that a network is only as good as the links between computers, so if you start with one-hundred computers and another your not adding another computer but your creating a hundred new connections, and it goes on to say that world building is the same way, that the world is only as good as the connections within the world. I began working on a world with this idea in mind but stumbled upon a real difficulty actually creating connections.
For example let's say (hypothetically) that I created two countries and I wrote up a thousand years history for each country then I placed these new nations on my map next to each other it's a little hard to connect these nations and make it seem like these connections weren't added afterwords and thereby feel false. Example: These two nations go to war for over decade how does this war affect the nations? Or better yet how does the war affect the rest of the world? These kind of connections seem difficult to actually make.
Another example: In a forest know as the Nothern Pines of Aranorren there are two grand elven cities that are exactly the same (sometimes called the twin cities) in all respects as far as architecture goes. Every hundred years the elves have a tournament at a place know as Ragnorak to essentially prove which city is superior. Now the problem comes in when I try to connect this with the rest of my imaginary world. How in the world do elves in a Forrest far to the north have anything to do with dwarves in the mountains or the two nations or anything else in the world around them but they have to affect the rest of the world somehow, look at the real world everything we do has an effect on others no matter how small it is.
It's like putting a puzzle together except instead of trying figure out what goes where your making the pieces one at a time.
So my question is this: How do I effectively create good story connections that are easy to connect to other locales and together make an interesting world?
Or how do I make puzzle pieces and then make the puzzle pieces fit together to make a larger cohesive picture when it's done?