John Davidson Rockefeller, commonly known as John D. Rockefeller, made his fortune in the oil industry. He was the founder of the Standard Oil Company, which became the largest oil refinery in the world during the late 19th and early 20th centuries. Rockefeller's success in the oil industry made him one of the wealthiest individuals in history.

Rockefeller's rise to wealth began in the 1860s when he co-founded an oil refinery in Cleveland, Ohio. He quickly recognized the potential of the oil industry and began acquiring and consolidating oil refineries in the region. By 1870, Rockefeller had established the Standard Oil Company, which would go on to dominate the oil industry in the United States.

Rockefeller's business practices were controversial, as he employed aggressive tactics to eliminate competition and control oil prices. He was accused of engaging in unethical practices, such as price-fixing and bribery, to maintain his monopoly in the industry. However, Rockefeller's ruthless business tactics were also credited with driving down the cost of oil and making it more accessible to the general public.

By the early 20th century, Standard Oil controlled over 90% of the oil refineries in the United States. In 1911, the company was broken up by the Supreme Court under antitrust laws, leading to the creation of several independent oil companies, including ExxonMobil, Chevron, and BP.

Despite the breakup of Standard Oil, Rockefeller remained one of the wealthiest individuals in the world. He diversified his investments into industries such as banking, railroads, and real estate, further expanding his wealth and influence. Rockefeller's success in the oil industry revolutionized the way business was conducted in America and established him as one of the most powerful and influential figures of his time.

In conclusion, John D. Rockefeller made his fortune in the oil industry through the establishment of the Standard Oil Company. His aggressive business tactics and ruthless pursuit of dominance in the industry led to his immense wealth and power. While his methods were controversial, Rockefeller's impact on the oil industry and business world cannot be denied.

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