How did changes to the railroad help American industries grow?

Railroads often owned the right-of-way along the tracks, thus facilitating the sale of land to potential homeowners. Railroads also made it easier to get mail and consumer goods to people who had moved West.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.

it made the ground more soft which is better for the world because no one likes walking on a rocky road it hurts your feet