Some time ago, probably the 80's or early 90's, I saw an article about the "Pizza Triangle": Hartford to the north, New London to the east, and New Haven (or maybe Bridgeport) to the west. Having grown up in the middle of that, it made sense to me. My little hometown of 8000 souls had a dozen or more pizza joints, always including Italian, Sicilian, and Greek.
Part of the culture shock of moving south was the lack of pizza. I knew I was in trouble when Pizza Hut was the best in town. Here in the burbs of DC it's a bit better, but 90% of the time, when I have pizza it's my own.