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John D. Rockefeller lost his fortune in the stock market crash. This was significant because the wealthiest businessmen in America also were very affected by the stock market crash of October 29, 1929, better known as the "Black Tuesday." Historians say that almost fourth-fifths of his fortune vanished after the stock market crash.
Not only Rockefeller was affected. Other rich industrials like Henry Ford and Andrew Carnegie lost millions of dollars from their companies, Ford Moror Company and US Steel, respectively.