voiceofpraisell
Answered

The steady progress of industry in the United States was possible because

ANew sources of energy allowed industry to develop
Bman's creative mind developed methods to increase production
Cimproved methods of transportation and communication where developed
Dall of the above

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Verified Answer :

davidyangnyc
Dall of the above, coal and oil were discovered
new inventions were created
telegram and railroads were built
hardysouthern

Answer:

d. all of the above

Explanation:

The industry evolved with creative and revolutionary technologies in such a way that the progress was very steady. There was new energy sources, new production methods, new methods of transportation and the more developed industry would become to the market, the more things it could use to further develop itself.

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