[Ans] The world's first billionaire made his fortune in which industry?

Step 1 : Introduction to the question "The world's first billionaire made his fortune in which industry?"

... The American business magnate John D. Rockefellerbecame the world's first confirmed U.S. dollar billionaire in 1916. As of 2017, there are over 2,000 U.S. dollar billionaires worldwide, with a combined wealth of over US$7.7 trillion.

Step 2 : Answer to the question "The world's first billionaire made his fortune in which industry?"

Oil:

Oil magnate John D. Rockefeller became the world's first billionaire in 1916. He was a co-founder of the Standard Oil Company, which dominated the oil industry. Rockefeller's wealth soared and he became the world's richest man and the first American worth more than a billion dollars, controlling 90% of all oil in the United States at his peak. His fortune upon his death in 1937 stood at $1.4 billion, which at the time, accounted for more than 1.5% of the national economy. Adjusted for inflation, Rockefeller was worth an estimated $340 billion in today's dollars.

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