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6 December, 20:45

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

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  1. 6 December, 21:09
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    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.
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