Wikipedia recognizes 11 regional pizza types in the United States: California-style, Chicago-style, Detroit-style, Grandma pizza, Greek, Jumbo slice, New Haven-style, New York-style, Trenton-style, Quad City-style, and the infamous St. Louis-style. My goal is to one day try them all.
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When I lived in Cambridge, MA I recall the Greek style being really popular there
Most of the Greek places were "[locality] House of Pizza." Really nothing special. I think they all probably bought equipment and recipes from the same vendor. However, most of them made good hot subs / grinders.
In New Haven, there's actually a Greek-style place that was very popular among students and Alums called Yorkside. They started up just about the time I started college, so it's funny to see how a few of us have aged when I stop by. I used to hit it on my drives up to Boston, along with Ashley's ice cream and the coffee / tea place on the block (now Blue State Coffee but before that Koffee Two). Nice family dishes. Goodness I hope they are surviving without the foot traffic.
Also, there used to be a place Bulldog Pizza across from the old Rudy's on Elm and Howe. Greek, not very good at all, but the owner Spiro became a big John Anderson fan in 1980, probably because Anderson's wife was Keke Machakos Anderson. HE even had a "Keke Special" on the menu - whole wheat crust, feta, olives, and probably some tomato slices, too. I ordered it a few times. The campaign had Keke stop by Bulldog for a photo op I think during the run up to the general election.