Answer :
Final answer:
Railroads and industrialization were key factors in Chicago's growth during the 19th century.
Explanation:
Railroads and telegraph lines played a significant role in Chicago's growth in the nineteenth century. The expansion of railroads allowed for the movement of goods and people, contributing to the city's development as a hub for transportation and industry. Additionally, the development of industrialization in Chicago, particularly in sectors like meatpacking, led to rapid population growth and economic prosperity.
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