
The Mississippi River corridor serves as the primary artery for transport and topography in this late nineteenth-century survey. The river's complex system of channels and islands separates the Illinois settlement of Savanna from Sabula on the Iowa side, with the Illinois Iowa Boundary Line threading through the water. While the river dominated commerce, the burgeoning rail network of the Chicago Burlington and Northern Railroad and the Chicago Milwaukee and St. Paul Railroad shows a landscape shifting toward overland industrial connections.
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