Answer:
Chicago's manufacturing and retail sectors, fostered by the expansion of railroads throughout the upper Midwest and East, grew rapidly and came to dominate the Midwest and greatly influence the nation's economy. The Chicago Union Stock Yards dominated the packing trade.Chicago was incorporated as a town in 1833 and as a city in 1837, when its population reached 4,000. In 1848 Chicago got its first telegraph and railroad. By 1854 the city was the world's largest grain port and had more than 30,000 residents, many of them European immigrants.
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