Question

which of the following statements best describes environmental changes caused by westward railroad expansion?
western forests were cut down for lumber for railroad and bridge construction.
western factories were built in what had been wooded rural areas.
changes occurred only in the western plains, where animal populations decreased.
the railroad expansion caused no environmental changes in the west.

Explanation:

To solve this, we analyze each option:

• Option 1: Westward railroad expansion required lumber for construction, so cutting western forests for railroad/bridge lumber is a valid environmental change.
• Option 2: Factories being built in wooded rural areas was not a primary environmental change from railroad expansion (railroad expansion's direct environmental impact was more about resource extraction for rail construction, not factory - building).
• Option 3: Environmental changes from railroad expansion were not limited to the Western plains (e.g., forested areas were also affected), so this is incorrect.
• Option 4: Railroad expansion clearly caused environmental changes (like deforestation, disruption of habitats), so this is wrong.

Answer:

A. Western forests were cut down for lumber for railroad and bridge construction.