Pizza arrived in the United States with Italian immigrants in the late 19th century, largely concentrated in Italian neighbourhoods of New York, and stayed a mostly local, working-class food for decades before spreading nationally.
The first American pizzerias
Lombardi's, generally credited as the first licensed pizzeria in the United States, opened in Manhattan's Little Italy in 1905. For the following few decades, pizza remained largely confined to Italian-American communities in cities like New York, Boston and Chicago.
World War II and the national spread
American soldiers stationed in Italy during World War II encountered pizza directly and, according to widely repeated accounts, returned home asking for it, which helped push the dish beyond Italian-American neighbourhoods into wider popularity through the late 1940s and 1950s.
Regional styles take shape
Chicago's deep dish is generally traced to Pizzeria Uno, which opened in 1943, while Detroit's square pan style developed separately in the 1940s around automotive part pans repurposed in home kitchens and small bakeries. New York's thin, foldable slice tradition solidified around the same period as a fast, affordable lunch for factory and dock workers.
Chains and the delivery era
The rise of national chains from the 1960s through the 1980s standardised pizza as a delivery food, introducing the 30-minutes-or-free delivery model that shaped consumer expectations for decades, even as independent regional pizzerias continued to compete on style and quality rather than speed.
The current era
Recent decades have seen a split between fast, app-driven delivery pizza and a renewed interest in artisanal, wood-fired Neapolitan-style pizza, alongside continued regional loyalty to New York, Chicago, Detroit and Sicilian styles depending on where you grew up.