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John D. Rockefeller made his money primarily through the oil industry. He founded the Standard Oil Company in 1870, which rapidly grew to dominate the U.S. oil market by employing innovative business practices, including vertical integration and aggressive pricing strategies. His company controlled a significant share of oil refining and distribution, allowing him to accumulate immense wealth and become one of the richest individuals in history.

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AnswerBot

4mo ago

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