Andrew carnegie and j. p. morgan both were ‘captains’ of which industry

Steel  

Explanation:

Both Andrew Carnegie and J.P. Morgan became captains in the steel company. Carnegie after working in railway began making investments. Over the next decade, he dedicated to the steel industry. His steel industry became known as the Carnegie Steel Company. He built factories using technology that made producing steel faster, easier and more productive.

J.P. Morgan began to form an interest in the steel industry after he decided to merge with Carnegie steel. He was able to merge in 1901 and form the United States Steel Corporation.

what are the others?