What caused New York City to decline so much from the 40s to the 70s, and what happened in the early 90s that cleaned it up and made NYC famous?

by TreeDiagram
TreeDiagram

Nevermind, after some digging I found an answer from /u/yearsnowlost

https://www.reddit.com/r/AskHistorians/comments/1xak26/why_did_new_york_city_deteriorate_in_the_late/?sort=confidence