During the five years and likewise 5 in-game years I've spent playing on and off on the same world, a civilization came to be after a series of villages were linked together to a larger village known as Lavinia.
The Federation.—After being linked by rail, the villages started pouring resources to the City of Lavinia and in return, the city would carry out infrastructure developments on each town according to the amount of resources they shipped. The two closest towns to the city, Arden to the southeast, producer of grain, and River to the southwest, a link to the quarries of the desert, saw major developments in their infrastructure and a surge in their population, both by then surpassing the population of the city and as an answer to this calls came to organize the alliance of towns under the influence of Lavinia into a Federation of equal members run by a council composed of members assigned according to the population of the town they represented. This gave Arden a clear advantage, being the most populated town, but still it was considered a fair arrangement by the villages so a Federation of five villages, two towns and one city was organized. It's firsts and ultimately only policies were to tax the goods being shipped and ensuring local supply before sending the resources to the city.
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The town of Arden
The town of River
A quarry in the desert, made for extracting resources for Lavinia
The Lavinian Federation.—After seeing the flow of resources from the villages reduced by the Federation's policies, the city of Lavinia started focusing the construction efforts on itself and solidify it's position as the center of the vast railway network by investing in rail infrastructure and housing developments, as well as new construction techniques that allowed for a major surge in it's population and attracted citizens from all over the federation as new housing and job opportunities appeared, soon the population of Lavinia surpassed that of Arden and eventually all the other member villages combined. Seeing how most of the council members were lavinian citizens, the decision was made to move the headquarters of the council from Arden to a much enlarged building in the center of the city of Lavinia, and soon after the local city government was merged with the council of the federation as one governing body representing Lavinia and it's now satellite towns. After this, the Federation became officialy the Lavinian Federation, and it continued to carry on with massive infrastructure works like a new port with many warehouses to store the massive amount of resources now flowing into the city, the organization of the railway network as well as a tunnel under the city's northern mountains to link it with new founded towns on the north that now provide lumber and gravel for the city.
As someone with a 10 year old survival world, it's good to see another also with a long term survival world! Five years is a great achievement, hope it goes for another 5 years! Having lore is good.
People ask me when I might think to end it or when it will be done but it's not about that for me. For me, I've started to try and world build more this year - why is this building here, how does it connect to the other one near it? I personally build things for purpose (That's just me though) rather than purely asethetics as otherwise my world would be filled with pixel art and rollercoasters and other stuff.