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Pizza was introduced to the United States in the 1890s along with waves of Italian immigrants who settled primarily in the larger cities of the Northeast, such as New York, Philadelphia, Boston, New Jersey, New Haven and Baltimore. Pizza and pizzerias rapidly grew in popularity in the late 1940s.
During the latter half of the 20th century, pizza became an iconic food with considerable acceptance in the United States. Numerous regional variations have evolved, with many bearing only a casual resemblance to the Italian original. Pizza is a popular item produced by many small restaurants as well as several large pizza restaurant chains. The United States pizza restaurant industry was worth $37 billion in 2015.
Pizzerias in the U.S. opened in New York City's Little Italy in 1894, 1903, and 1905, producing a Neapolitan-style pizza. Other early locations included San Francisco, Trenton, Boston, Baltimore, and New Haven, Connecticut.
The word pizza was borrowed into English in the 1930s; before it became well known, pizza was generally called "tomato pie" by English speakers. Some regional pizza variations still use the name tomato pie.
Distinct regional types developed in the 20th century, including Buffalo, California, Chicago, Detroit, Greek, New Haven, New York, and St. Louis styles.
Thirteen percent of the United States population consumes pizza on any given day.

American pizza (particularly thin-crust) is made with a very high-gluten flour (often 13–14% protein content) of the type also used to make bagels; this allows the dough to be stretched thinly and thrown vigorously without tearing. Unlike Italian pizza, American pizza often has vegetable oil or shortening mixed into the dough. This can range from a small amount in relatively lean doughs, such as New York–style, to a very large amount in some recipes for Chicago-style deep-dish dough.
The most common cheese used on US pizzas is mozzarella. Other popular cheeses include parmesan, provolone, romano, and ricotta.






Media related to Pizzas in the United States at Wikimedia Commons