
The Fox River valley serves as the primary corridor for development in this mid-1980s portrait of northern Illinois. Massive suburban expansion is evident from the dense street grids of Naperville and Wheaton westward toward Aurora, while the western reaches of De Kalb County maintain a landscape of section lines and small agricultural centers like Somonauk and Leland. This contrast highlights the period when the Chicago metropolitan area was rapidly pushing into once-rural prairies, facilitated by the East-West Tollway.
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This is the sole edition of this map. No revisions or reprints were ever made.