It has been 100 years since we landed on our new home world, Julie. Julie was named after the captain's wife who died during the failed jump that landed us here.
It was decided to break the ships passengers and crew up into 5 clans. Not all members of a clan were of the same family. The brontosaurus had effectively six decks. was a good half mile in circumference. Each clan was assigned to a deck with the bottom deck being held in reserve for parks and industries.
We have not built outward as humans in the past have but upward. The rule is once a clan has to many people for it's floor it pays to have a new floor built and is then divided in half and a new clan is born.
Every tenth floor is reserved for parks and industries every twentieth floor is reserved for a hospital. Each clan policies it's floor and fights small fires. Each city builds upward until it reaches Geo orbit. Geo orbit is where a satellite would remain above the same spot on the ground. As the city adds a floor, the floor gets smaller until reaching the half way point then it starts to get larger again to use the rotation of the planet to up hold the city up. When the city reaches max height a space dock is built to allow space ships to dock with the city.
Julie is big enough to hold 15 cities this way.