Why are andrew carnegie, john d. rockefeller, and j. p. morgan considered as "captains of industry"?

The term "robber baron" was applied to powerful nineteenth-century industrialists who were viewed as having used questionable practices to amass their wealth. On the other hand, "captains of industry" were business leaders whose means of amassing a personal fortune contributed positively to the country in some way. Another thing was, the wealthy elite of the late 19th century consisted of industrialists who amassed their fortunes as so-called robber barons and captains of industry. ... They made their wealth — and used it — in a way that would benefit society, such as providing more jobs or increasing productivity.

Explanation:

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