
Mackinaw River meanders across the northern half of this Central Illinois landscape, carving a valley through the glacial till of Sand Prairie and Elm Grove. The era's transportation network is defined by a dense intersection of rail lines, with the Illinois Central, Chicago and Northwestern, and Chicago and Alton railroads converging at key junctions like South Pekin and Delavan. These tracks supported a thriving agricultural economy, connecting small grain-handling points and settlements such as San Jose and Green Valley to regional markets.
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