Sister city
Agreement between geographical entities / From Wikipedia, the free encyclopedia
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"Sister cities", "Twin town", and "Partner city" redirect here. For the films, see Sister Cities (film) and Twin Town. For the phenomenon of cities located close to each other, see Twin cities.
A sister city or a twin town relationship is a form of legal or social agreement between two geographically and politically distinct localities for the purpose of promoting cultural and commercial ties.[1]
While there are early examples of international links between municipalities akin to what are known as sister cities or twin towns today dating back to the 9th century,[2] the modern concept was first established and adopted worldwide during World War II.[3][4]