Answer:
D. many new towns and settlements grew.
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.
The main cause of shift from Paleolithic(Old Stone Age)to the Neolithic Age(New Stone Age) is that the temperatures were getting warmer, so now this shift was a great impact on the population.. Now people were able to be sedentary because of the warmer climates and make new civizilations, laws, and government structures.
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