Final answer:
John D. Rockefeller, Andrew Carnegie, and Cornelius Vanderbilt were influential industrial tycoons in the late 19th century.
Explanation:
John D. Rockefeller led Standard Oil, Andrew Carnegie dominated with Carnegie Steel, and Cornelius Vanderbilt was a prominent figure in railroads such as Central Pacific Railroad. These industrial tycoons were part of a select group that held significant power and wealth during the late 19th century, a period known as the Gilded Age.
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