Chapter 7 - Megalopolis

New York city is part of the Northeast Megalopolis which is the most heavily urbanized region of the United States.

There is also a lot of ethnic diversity in the Megalopolis region. The demographics of New York City are evidence of a large and ethnically diverse metropolis. It is the largest city in the United States with a population defined by a long history of international immigration.  New York City is home to more than 8 million people, accounting for about 40% of the population of New York State and a similar percentage of the New York metropolitan area, home to about 22 million. Over the last decade the city has been growing faster than the region.  The New York region continues to be the leading metropolitan gateway for legal immigrants admitted into the United States.

REFERENCE: http://en.wikipedia.org/wiki/Northeast_megalopolis