Urban Secession

Urban secession is a city's secession from its surrounding region, to form a new political unit. This new unit is usually a subdivision of the same country as its surroundings, but in some cases, full sovereignty may be attained, in which case the unit is usually called a city-state. It is an extreme form of urban autonomy, which can be expressed in less formal terms or with ordinary legislation such as a City Charter.

Urban secession movements theories of why a city should be at least partially independent of surrounding regions, goes back to Classical Rome, 17th-century London, 18th-century Amsterdam and other centers of commercial activity. Comparisons focused on the modern nation-state and its relationships to the more traditional feudal city-state government.