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An autonomous area may be a territory, a district, a city-state, a tax haven, or any area defined by a contract or treaty that has some freedom from an external authority. For example, Washington D.C. is a city-state that operates with some degree of independence from laws governing American states. London is another example of a city-state. An autonomous area may be set up to allow specific taxation rules or lack thereof. There are thousands of autonomous areas, and they are constantly changing.
Some autonomous areas are recognized by international treaties. Examples of this are Hong Kong and the Panama Canal Zone. Great Britain controlled Hong Kong until it was given back to China. China has eroded Hong Kong residents’ rights and moved to replace Hong Kong law with mainland China exercising complete control. The Panama Canal Zone was an autonomous region managed by the United States until it was returned to Panama.
Other autonomous areas are created by internal regulations. Denmark owns Greenland. However, Greenland can operate separately with much autonomy, almost like an independent country.
A common form of autonomy is to be a territory of another country. Here are a few more examples:
Moreover, sub-national regions may become autonomous. An example of a country with many of these sub-national regions is Spain with these autonomous areas: Andalusia, Aragon, Asturias, Balearic Islands, Basque Country, Canary Islands, Cantabria, Castile–La Mancha, Castile and León, Catalonia, Extremadura, Galicia, La Rioja, Madrid, Murcia, Navarre, and Valencian Community.