Which of the following statements best describes how railroad expansion affected the environment during the late 1800s?

Railroad expansion required large amounts of timber for tracks, ties, stations, and bridges. As railroads spread across the West in the late 1800s, western forests were cut down to supply this wood. Bison were not domesticated to make room for railroads, and the statement about eastern forests does not describe the main environmental effect associated with western railroad expansion.

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