Pizza’s certainly not indigenous to NYC. But New York–style pizza is a very particular item, and the first pizzeria in America was Lombardi’s, which opened here in 1905. While Chicago-style is ‘deep dish’ and Californian tends to be light and doughy, New York prides itself on having pizza with thin crust and an even thinner layer of sauce – and slices that are triangular (unless they’re Sicilian-style, in which case they’re rectangular).