The Top 5 Richest Americans of All-time

  Name Net Worth
(estimated)
Date of Birth/Death Source of Wealth
1 John D. Rockefeller $336 billion July 8, 1839 to
May 23, 1937
Industrialist
(petroleum)
2 Andrew Carnegie $309 billion November 25, 1835 to
August 11, 1919
Industrialist
(steel industry)
3 Cornelius Vanderbilt $185 billion May 27, 1794 to
January 4, 1877
Industrialist
(shipping and railroads)
4 William Henry Gates $136 billion October 28, 1955 to ? Information Technology
5 John Jacob Astor $121 billion May 20, 1750 to
December 26, 1831
Fur trader
(also real estate)
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Sources:  Peter W. Bernstein, Annalyn Swan: All the Money in the World (ISBN-10: 0307266125), Forbes.com, Businessinsider.com

List Notes: Each persons wealth was calculated at it's peak, compared to the gross domestic product at the time, and converted into 2011 dollars. All figures are in US dollars. List is current as of 2015.
Richest Americans of All-time

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