When was the vast majority of wealth created in America, and by whom: (a) Carnegies, Vanderbilts, and

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When was the vast majority of wealth created in America, and by whom:
(a) Carnegies, Vanderbilts, and Rockefellers before 1990?
(b) Automobile, food, and real estate mag-nates after 1900 but before 1970?
(c) Founders of companies since 1970?
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