Sister city

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]

^ Clarke, N. "Town Twinning in Britain since 1945: A Summary of findings" (PDF). School of Geography, University of Southampton. Archived from the original (PDF) on 29 July 2013. Retrieved 29 July 2013.
^ Cite error: The named reference Origins was invoked but never defined (see the help page).
^ Cite error: The named reference :0 was invoked but never defined (see the help page).
^ Cite error: The named reference :1 was invoked but never defined (see the help page).

[Clarke-1] Clarke, N. "Town Twinning in Britain since 1945: A Summary of findings" (PDF). School of Geography, University of Southampton. Archived from the original (PDF) on 29 July 2013. Retrieved 29 July 2013.

[Origins-2] Cite error: The named reference Origins was invoked but never defined (see the help page).

[:0-3] Cite error: The named reference :0 was invoked but never defined (see the help page).

[:1-4] Cite error: The named reference :1 was invoked but never defined (see the help page).

[1]

[2]

[3]

[4]