Answer:
D. many new towns and settlements grew.
Step-by-step explanation:
The system of road made a significant contribution to the formation of the United States as an economic power and an industrial nation. The fertile lands of the West attracted a huge number of immigrants, who in the shortest period of time began to develop agriculture on them.
The railroad created many villages along the way: Fremont, Elkhorn, Grand Island, North Platt, Ogallala and Sydney, as the railroad followed Platt through Nebraska.