
Springfield serves as the focal point of this Central Illinois region in the mid-1980s, where the convergence of the Sangamon River and several major transportation corridors highlights the city's role as a political and logistical hub. The map detail reveals the urban expansion around Lake Springfield and the dense concentration of civic sites, including the State Capitol and the Lincoln Home National Historic Site. To the east, Decatur anchors the edge of the sheet near Lake Decatur, while smaller agricultural settlements like Chatham, Auburn, and Rochester are connected by a network of railroads including the Illinois Central Gulf RR and the Norfolk and Western Ry.
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