During the second industrial revolution, railroad expansion increased white settlers in the West and more secluded areas away from cities.
Option d is correct.
The railroad is a track or system of tracks made of steel rails that carry passenger and freight trains.
It is a system of tracks with the trains, administration, and forces necessitated for its workings.
The growth of railroads in the west during the second industrial revolution boosted the number of white settlers, and the more secluded areas away from cities
Therefore, option d is correct.
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