
The Rock River valley serves as the primary corridor for settlement and industry across north-central Illinois and southern Wisconsin in the mid-1950s. At the heart of the region, Rockford and Beloit appear as established manufacturing hubs, their growth mirrored by the dense network of lines from the Chicago and North Western RR and the Illinois Central RR that link small agricultural centers like Brodhead and Fort Atkinson. The landscape transitions from the flat expanse of Big Foot Prairie to the glacier-carved lakes of the east, where Lake Geneva and Lake Koshkonong define the recreation and drainage patterns of the area.
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