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What percentage of all oil in the United States did Rockefeller control at his peak?
90%
70%
80%
50%
Answer
At the height of his career, John D. Rockefeller controlled a staggering 90% of all oil in the United States. This dominance in the oil industry contributed significantly to his immense wealth.
The Rockefeller Riddle: Unleashing the Legacy of John D. Rockefeller
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