...in which babies signal their consumer choices

[lagoo]

The last chapter, which literalizes this sense perhaps a little too much, depicts a futuristic New York, in which babies signal their consumer choices with handsets and audiences are manipulated by selected enthusiasts known as “parrots.”
https://www.nytimes.com/2010/07/11/books/review/Blythe-t.html

My question:
In the sentence above, does ‘in which’ mean ‘in the last chapter’ or ‘in the futuristic New York’?
Thanks in advance.

 

[Charlie Bernstein]

New York.

When you see noun/comma/in which, the noun is what in which refers to.

It can also refer to an entire noun phrase, like a New York of the future.

(Cross-post.)