>>936797678
New York only has 3 days of food on hand at any given time
This is because of "just in time" delivery- Schlomo Goldsteinberg would rather turn his warehouse into (50) 200 square foot apartments he can rent for $3,200 a month than store a weeks worth of food for his deli.
Water is also piped in from hundreds of miles away.
Very few people own vehicles.
Pic related is millions of people trying to get home after the blackout of 2003 (that luckily happened on a friday afternoon). Take out 1 major power sub station and it will cause a cascade failure of the entire eastern seaboard.
No subway.
No A/C.
No water.
No access for food delivery.
And no way to leave.