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Thus, when the banker John Pierpont Morgan left a fortune of $68 million in 1914, the steel magnate Andrew Carnegie is supposed to have remarked pityingly that he had by no means been “a rich man.”203 Carnegie’s own fortune and those of industrialists like John D. Rockefeller, Henry Ford, and Andrew W. Mellon were over half a billion dollars. The rapidity of the concentration of wealth may be gauged from the fact that the largest American private fortunes grew from about $25 million in 1860 to $100 million twenty years later and $1 billion two decades after that. By 1900 the richest man in the United States had assets worth twelve times more than those of the richest European (who was a member of the English aristocracy); not even the Rothschilds (finance), the Krupps (steel, machinery, weapons), or the Beits (British/South African gold and diamond capital) were in the same league.
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Jürgen Osterhammel (The Transformation of the World: A Global History of the Nineteenth Century (America in the World Book 20))