How did the growth of the railroads affect supply and demand for natural resources in the United States?
The growth of the railroads decreased the supply of natural resources.
O The growth of the railroads decreased the demand for natural resources.
O The growth of the railroads increased the demand for natural resources.
O The growth of the railroads had no effect on the supply of natural resources.
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Answer:

B. The growth of the railroads increased the demand for natural resources.

Explanation:

Railroad transportation changed the way American people traded. For instance, agriculture products were transported easily throughout the country.