SAT Subject US History Practice Question 257: Answer and Explanation

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Question: 257

58. The success of which of these nineteenth-century inventions was a direct result of the growth of the railroads?

A. Telephone
B. Automobile
C. Threshing machine
D. Telegraph
E. Colt revolver

Correct Answer: D


The railroad made the telegraph possible. The railroad carried people to distant locations, thus creating a need for long-distance communication and also sending people out to string the telegraph wires and build and staff the telegraph offices.

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