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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, and Baltimore. Pizza and pizzerias rapidly grew in popularity in the late 1940s.[1]
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.[2][3]