I think I know what your asking... For a very long time cities only held the area around it. The way that we get beyond City-States is likely more along the lines of every more complex unions and leagues of governmental bodies being agreed to.
We think of Greece as single state, but really it is a group of leagues of city-states. My thought is that each level up got less specific and more generalized laws that each step below agreed. Basically, something like how we have today with the various states and unions. We now call that UN of of Greece Leagues the Greek Culture, but it really is no different than something like the UN to the world today, just at a different scale. That didn't all happen due to war. Some, or even a majority of it was due to having to interact with these other people. So I'm pretty sure that is how to go from City to what we consider a State now adays.
You're sorta missing the reason why those green ones exist. They're red, but become green because the other red ones get funneled through them...So each red dot/town would be the settlement of a politically independent tribe, but then some of them would become chiefdoms (cities, in green) and gain influence over other tribes/towns, eventually getting more complex and one chiefdom defeating the others and becoming a proto state.
Don't know really, but given what I've seen generally towns build bridges if the river is small enough or the edges are high enough to let the boats go through. Otherwise I'd think, more or less they do stick to one side in a general area because you're not going to jump back and forth between sides and it probably isn't the safes thing to do to have a city competing on the direct other side of the river. One side would likely eventually get destroyed, or peace would come about and the two would merge in most cases.Questions:
- Settlements only develop in one side of the river?
Let's assume there is no sea trade at the moment...- With so many ramification on my river, how do you settle a hierarchy? Which crossroad (G, H, I) is more important? Which end (A, B, C) is the most logical dominant? Is it F once trade with the coast becomes key?
G controls access to A and C to H.
And G controls access to H to A and C
So if we're dealing with just those 4 G is the most powerful. It is the Governor of the area, literally. It Governs the flow of trade.
you have the same situation with B, I, H, and G, but with G and H's positions reversed.
I controls E and F to H
So if you take these as 3 seperate systems H, I, and G are the Governors of their respective areas which makes them the Capital, because trade, power, etc runs through them.
But it becomes fairly obvious where the lynch pin is. H controls access from G to I, as well as to B meaning that it controls trade from 1 major city to another.
Looking at it, perhaps the easiest way to figure it out is this...
All non-crossroad major cities give them a +1. So A, B, C, F are all +1s
If one of the above major cities has to cross through a major city to get to another, add +1 to the one it crosses through... A must go through G to get to C or H so G gets +1. C must go through G to get to A or H, so add another 1 to make it +2.
That process will give you G and I a +2, and H a +1.
Now, any major city that a +2 has to go through to get through to get to another add 2 to in the same way as above... This gives H a +3.
The roads could change this balance as well because any city that is a 3 to 5 day walk away from water is safe enough to risk and thus eventually will be done rather than going down and around in various areas, like between E & H which is roughly a 2 to 3 day walk if you just walk straight there rather than follow the river. Traders would still use the river though if they can because they can carry more and it is likely roughly the same travel time (roughly speaking by boat takes 1/2 the time by walking) though I'm uncertain given that the currents of the river might slow them. But anyways, this new path way would add to the control of the area by H.
I hope that helps and explains it a bit more.