John D Rockefeller Jr

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The Supreme Court ruled in 1911 that Standard Oil must be dismantled for violation of federal anti-trust laws. It was broken up into 34 separate entities which included companies that became ExxonMobil, Chevron Corporation, and others—some of which still have the highest level of revenue in the world. Individual pieces of the company were worth more than the whole, as shares of these doubled and tripled in value in their early years, and Rockefeller became the country's first billionaire with a fortune worth nearly 2% of the national economy. His peak net worth was estimated at US$409 billion (in 2018 dollars; inflation-adjusted) in 1913. [d] Rockefeller spent the last 40 years of his life in retirement at his estate in Westchester County, New York. His fortune was mainly used to create the modern systematic approach of targeted philanthropy through the creation of foundations that had a major effect on medicine, education, and scientific research. His foundations pioneered the development of medical research and were instrumental in the near-eradication of hookworm and yellow fever in the United States.