Final answer:
Improvements in the railway system led to industrial growth in the United States through increased travel to cities, greater demand for manufactured goods, and stimulation of related industries.
Step-by-step explanation:
Improvements in the railway system led to industrial growth in the United States in several ways. First, the expansion and improvement of the railway system made it easier and more efficient for people to travel to cities, allowing for greater movement of both people and goods. Second, the railway system created a greater demand for manufactured products, as it provided a fast and reliable means of transportation for goods across the country. Finally, the railway system stimulated growth in related industries such as steel manufacturing, coal, and wood, further accelerating industrial development.