The term you are referring to is a city-state. A city-state is a sovereign state consisting of a city and its dependent territories. These entities have their own government, economy, and culture, and historically, they were common in ancient times, particularly in regions like ancient Greece and Mesopotamia. City-states often had a high degree of autonomy and were able to conduct their own affairs independently of neighboring states.
A city-state is an independent or autonomous entity not administered as a part of another local government whose territory consists of a city and possibly its surrounding territory.
demain
Feudalism is a political system in which land is given for military.
Country's borders change do to the sale of land, the restructuring of county lines perhaps, wars where land is taken and gained thus changing the borders...
land reform;economic reform;Great Leap Forward;political reform;social reform;
City-states
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District
Is a political unit made up of a city and its surrounding land
From Mesopotamia to the most famous rivers Tigris and Euphrates
A political unit that includes a city and all land around it is typically referred to as a metropolitan area or an urban agglomeration. This term encompasses the city as well as its suburbs and surrounding territories that are economically and socially integrated with the city.
County.