4 Answers

New York is overcrowded and compact.  I don't think New York has many alleys so the trash is piled on the streets.  

I know it goes more in-depth than my answer, but it's a good start.

....dirty streets or politics 

Billionaires and millionaires don't ever have to think about things like "cleaning". They have those "little people" to do everything for them. I doubt that those in charge even notice dirt.

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