Ask an American what "pizza" means and you'll get a wildly different answer depending on where they're from — the US doesn't have one national pizza style, it has half a dozen distinct regional traditions that barely resemble each other beyond the basic dough-sauce-cheese formula.
New York style
Thin, hand-tossed, large foldable slices, cooked hot and fast in a deck oven — the style most non-Americans picture when they hear "American pizza." The fold itself is functional, not aesthetic: it's how you eat a wide, floppy slice without the toppings sliding off.
Chicago deep dish and stuffed
Baked in a tall, round steel pan, built with cheese on the bottom and chunky sauce on top, deep dish is closer to a savory pie than what most of the country thinks of as pizza. Stuffed pizza takes it further, adding a second thin dough layer over the fillings. Both require a fork and 30-plus minutes of bake time — genuinely a different eating experience than a fast slice.
Detroit style
Baked in a rectangular steel pan (originally repurposed automotive parts trays, per the style's origin story), Detroit-style pizza has a thick, airy crust with a famously crispy, caramelized cheese edge where the cheese touches the pan and browns. Sauce typically goes on top after baking, in stripes, rather than underneath.
St. Louis style
A thin, cracker-like crust with no yeast, cut into squares ("party cut") rather than triangular slices, and topped with Provel, a processed cheese blend specific to the St. Louis area that behaves differently than mozzarella. It's a genuinely divisive style outside the region — locals love it, outsiders often find it unfamiliar.
New Haven style (Apizza)
Coal or wood-fired, char-heavy, thin, and irregularly shaped rather than a perfect circle — New Haven's "apizza" (pronounced ah-BEETS by locals) is considered by many pizza obsessives to be one of the most technically respected styles in the country, centered specifically around New Haven, Connecticut's Wooster Street.
Why this matters if you're traveling
Ordering "pizza" in an unfamiliar American city without knowing the regional style can lead to real surprise — showing up expecting a New York slice and getting a St. Louis square with Provel is a genuinely different food experience, not just a stylistic variation.