Buildings can be left independent and function just fine on their own, but there are advantages to making them into a city. Cities are formed when a capitol is built, and extended further with police stations.
The size of the jurisdiction depends on the police station building design used. The jurisdiction area of a city can be further extended by building more police stations.
For more information, see the Claim page.
The morale of a city's population determines if population is immigrating or emigrating. When morale is zero or positive, population will try to immigrate into the city. When morale is negative, the population will emigrate out of the city.
For more information, see the City Morale page.
| Known issue!
When population is zero the morale overwritten to be zero as well. This can hide large morale penalties and make citizen move out again right after immigrating in. Check city history report to try and catch a glimpse of a time when the morale is not overwritten.
Buildings and cities decay to remove unused and unwanted data from the game. If a city has no population for an extended period of time, buildings will start to crumble due to decay.
The exact mechanics of this in Hazeron Starship are currently unknown.