leaders of industry

In the late 1800's to the early 1900's John D. Rockefeller was the biggest leader of the oil industry. By the end of his career Rockefeller owned nintyfive percent of americas oil industry.At this time in history oil had an ever growing demand, oil was used to heat houses, power cars, and run electric engines. With out the progression of oil consuming inventions american would be consuming other valuable natural resources.