Which of the following was NOT a key industry growing at this time? A. Railroads
OB. Steel
C. Advertising
D. Banking

I believe the industry that is not growing at this time are the railroads.

Explanation:

I believe the railroad company is not growing right now because in many countries people are not even allowed to go outside, so how could they go on a train. For the countries that are allowing people to go out, the citizens that do go outside are usually people who need to go to their job and they will not go on a train because they will be trying to social distance and stay away from other people.

- "made the south's economy grow rapidly and a small effect that a lot of people don't know is that it made the more demand of slaves and cotton products. and also new states formed due to plantations growing in size."

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do u have any answer choices?