Wormhole travel system: how would they connect the systems?

Here, star systems are connected with "wormholes". The wormholes facilitate travel at $250\ c$, regardless of mass. They are made using special ships. Any travel (including military vessels) not through the wormholes is well below light-speed (not more than $0.05\ c$, ).

It takes a road builder ship $50$ years to make each endpoint and $30$ years to make a light-year of "road". So, for example, to connect two systems $10$ light-years apart, a road builder ship takes $400$ years. A road cannot be constructed by more than 1 ship, not even by building from opposite ends. All of a road has to be built by one ship. Additionally, roads cannot intersect in the middle.

• FTL communication faster than the wormholes (at $10000\ c$) is available, but the transmission and reception equipment are too large for ships and are generally constructed on planets.
• The wormhole endpoints orbit the stars, and are indestructible and immovable for the purposes of this question.
• The possibility of simply making the trip without a wormhole remains.
• There are "countries" in this setup; a country contains around as many systems as there are cities in a real-world country.
• Two adjacent countries are generally connected (edge system(s) with edge system(s))

My question:

How would governments connect their systems, and how would connection treaties be made (i.e. how the adjacent countries connect their countries)?

I picture only few (one?) connection between adjacent countries, because then only one system has to be defended in case of an invasion.

• A wormhole endpoint is an endpoint of only 1 road.
• A wormhole endpoint is 100 km in diameter and cannot be "turned off" (for the purposes of this question).
• Even in the roads, light travels at lightspeed, so incoming vessels cannot be detected early.
• 1) Can a single "endpoint" station connect up to multiple "roads" or does every road need two dedicated endpoint stations? 2) What can an operator of an endpoint station do (if anything) to prevent incoming travel? Can they "switch off" the endpoint? 3) What is the diameter of the wormhole entry/exit point? Can it be feasibly barricaded, as with the "iris" in Stargate? 4) Can entities linger in the wormhole? What capacity does an endpoint station have for detecting incoming users of the road? May 5, 2018 at 20:37
• @PinkSweetener 1) The latter. 2) Nothing (for the purposes of the question). 3) 100 km. 4) No; nothing. (Question edited to answer your question.) May 5, 2018 at 22:10
• What kind of Government are we talking about? Are there any kind of underlying threats going around? May 5, 2018 at 23:04
• I would expect both end-governments to have forts on both ends of the wormhole, in continuous encrypted contact with the other end, to provide an early warning of anything untoward (unauthorized entries, incoming armies and so on). And some kind of "cap" on the ends of the wormhole to prevent unrestricted ingress/egress; maybe the endpoints are inside hollow asteroids, or filled with mines in complex movement, so that you need an updated code to know where to safely exit. May 5, 2018 at 23:21
• For FTL communication, is it the same as the wormholes, a 1 to 1 connection, or can any ansible connect to any other ansible? May 5, 2018 at 23:40

This is how railroads worked ~1914

Since your transit network has finite speed, the dynamics are very similar to how Europe worked in the age before cars provided competition to rail.

Powerful nation states sponsor railroad networks within them. The networks may be run by private interests (as in England), by the state (Germany and Russia) or a combination of the two (France wasn't fully nationalized until 1938). But whoever runs them, the government controls how passes the borders.

Rail borders are obviously easier to control than the rest of the border, since railroads are discrete, but a border is continuous. Customs stations would be established at all crossings to ensure that appropriate tarrifs are paid, undesireables are kept out, etc.

Furthermore, in the case of Europe, not all railroads were compatible. In 1914, 1/3 of French railroads were narrow gauge as opposed to the standard gauge. Russia on the other hand, used 1525 mm broad gauge as opposed to the standard 1435 mm used for the main lines in the rest of Europe. This means that a train could not go direct from St. Petersburg to Paris; it would have to go to Warsaw, where the passengers would transfer to another train on a different rail system that would transfer. The Russians did this partially to ensure that rails could not be used by the rail stock of an invading German or Austrian army.