With a name that became essentially synonymous with wealth, who is the richest person in U.S. history?

Standard Oil founder John D. Rockefeller Sr. stayed at the helm from 1870 to 1897 and remained the largest shareholder until the Supreme Court broke up the company's monopoly in 1911 — an event that Rockefeller emerged from even richer. When adjusted for inflation, his fortune of approximately $900 million is equal to more than $400 billion in today's dollars. For those keeping tabs, that's more than Jeff Bezos and Elon Musk combined.

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