The correct answer is option A.
Industrial development in the united states before 1870 included an efficient transportation network.
In 1789, the first textile industry was set up in the United States after the emigration of Samuel Slater from Britain to Rhode Island.
After that, the United States saw an abrupt population growth which played a crucial role in the development of industries as there was enough supply of workers.
Moreover, the expansion of the railroad network across the country also proved a mark at the beginning of the industrial revolution as it completely transformed the American social class and structure.
As a result of the industrial development, there was a positive impact on American society as it improved the living standards of middle-class and upper-middle-class families.
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