Chapter 13.7 Fragmented Government
Cities traditionally grew through annexation.
Annexation is the process of legally adding land area to a city. Rules and regulations vary, given which state you're in.
Modern Government Expansion
Today, most urban areas have a large number of local governments due to the amount of people who want to stay more independent.
Governor Cuomo Vetoes Annexation Bill That Could Have Affected Kiryas Joel Plans
NSW government - Department of planning - Metropolitan Plan 2036