As a European, I'm confused and would love to know more about this specific area.
New York: New York, New Jersey, Connecticut.
Philadelphia: Pennsylvania, New Jersey, Delaware.
It isn't a useful concept to bring up when you are not physically in a tri-state area.
[0] https://en.wikipedia.org/wiki/San_Francisco_Bay_Area
[1] https://en.wikipedia.org/wiki/New_York_metropolitan_area
https://en.wikipedia.org/wiki/South_Bay_(Los_Angeles_County)
https://en.wikipedia.org/wiki/South_Bay_(San_Francisco_Bay_A...