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Developments in which of these industries made important contributions to improvements in the transportation system in the United States during the second half of the 19th century? a. petroleum b. steel c. mining d. aviation

Respuesta :

It was the development of the "steel" industry that made important contributions to improvements in the transportation system, since steel was the primary material used in building the railroads. 

Answer:

Question 10 (Worth 1 points)

(MC)Developments in which of these industries made important contributions to improvements in the transportation system in the United States during the second half of the 19th century?

petroleum

This one is right. steel

mining

aviation

Points earned on this question: 1

Explanation:

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