Final answer:
Chicago was one of the modern towns built to serve railroads during the expansion of railroad networks in the late nineteenth century.
Explanation:
Chicago was one modern town originally built to serve the railroads. The growth of railroads in the late nineteenth century led to the development of hub cities like Chicago, which experienced significant transformation and expansion due to railroad networks. The railroad system in the United States expanded rapidly, connecting different cities and facilitating the transportation of goods and people.
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