The Foundry was North America's heavily populated [napopden] manufacturing belt [namanuf]. Stretching from New York City to Milwaukee, Wisconsin [na9foun2]. It includes the Megalopolis [namegal] of the Eastern United States and the "Mainstreet" region of southern Canada.
It is a nation of large industrial cities. But the industrial base of these cities is declining, turning the "manufacturing belt" [namanuf] into a "rust belt". During its heyday the Foundry attracted the disadvantaged from around the world including African Americans from the southern states of Dixie. This influx of people looking for factory jobs has made the Foundry an multiethnic nation [usblack]. But with the decline of manufacturing these multiethnic cities developed cores of urban poor. Furthermore, the pollution created by the massive manufacturing plants still affects these cities. Large areas of urban land is contaminated and lies idle throughout the Foundry.
The Foundry includes Chicago. Some geographers define the Fox River as the Foundry's western border.