The Upper Midwest

As immigrants from the different regions of Italy settled throughout the various regions of the United States, many brought with them a distinct regional Italian culinary tradition. Many of these foods and recipes developed into new favorites for the townspeople and later for Americans nationwide.

Detroit

The growth of the automobile industry resulted in the increase of the Italian population in Detroit during the 20th Century. By 1925 the number of Italians in the city had increased to 42,000. The historical center of Detroit's Italian-American community was in an area along Gratiot Avenue, east of Downtown Detroit. There were larger numbers of southern Italians than those from the north. However, Armando Delicato, author of Italians in Detroit, wrote that "Unlike many other American cities, no region of Italy was totally dominant in this area".

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Source: http://jovinacooksitalian.com/