What state is the concrete jungle?

Noun. concrete jungle (plural concrete jungles) (idiomatic) An urban or other populated area containing a high density of buildings constructed of concrete or similar materials, especially one which lacks greenery and which seems unattractive, harsh, or unsafe.

eg:Many people decided to stay in Colorado, kick starting a migration that had continued into the present day. More people means more development and Denver has quickly transformed into a concrete jungle

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New York is the answer