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John D. Rockefeller is important because by the early 1880s standard oil controlled about 90% of an oil business , which he discovered. Rockefeller saw a great opportunity to start this business. In Cleveland, Ohio, he built his 1st oil refinery.

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Q: Why is John D Rockefeller important?
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No, John D Rockefeller is not single.


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John D. Rockefeller III was born in 1906.


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John D Rockefeller married to Laura Spelman in 1864


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