In terms of the industrial development of the United States in the late nineteenth century,the most important economic development was the

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The construction of railroad lines that linked all U.S. regions was the most important economic development in the late nineteenth century because it facilitated the transportation of goods, expanded markets, and allowed for the growth of industries such as mining, agriculture, and manufacturing. The railroads also played a significant role in the settlement of the West and the rise of urbanization.

In Terms of the Industrial Development of the United States