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John Jacob Astor was born in southwest Germany  but he later, at the end of the Revolutionary War,  immigrated to America. In New York he established a fur company to which became the leading exports to Europe and even all the way to China. He became a "Robber Baron" when he went from fur to Real Estate. He wanted acres and he got them. With 110.1 billion worth of net-worth, he became the fourth richest person in American history.

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In 1892, Morgan created General Electric by merging Edison General Election and Thomas Houston Electric Company. By 1901 he moved onto the steel business by buying Carnegie steel from Andrew Carnegie for $487 million and consolidated it with several other steel companies. Because of Morgan the steel company became the first billion dollar company in the world.

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Andrew W. Mellon made his wealth in fuel and aluminum. Mellon had a great amount of finance so he used that  to build his large enterprises in aluminum and coke, which is fuel, and this caused his wealth to grow to over 300-400 million.
Mellon was the third highest income tax payer right behind John D. Rockefeller and Henry Ford. Mellon also served as the U.S. Secretary of Treasury from 1921-1932

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John D. Rockefeller was always in oil because he founded the Standard Oil Company in 1870 and used that foundation to dominate the oil business. This made him become the richest man in the America and and the first American worth a Billion dollars. He later retired in 1897 and spent the rest of his 40 years setting up and defining modern philanthropy

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Andrew Carnegie was born in Scotland. throughout his life before his steel company, he had somewhat of a hard time. His first job was to change spools of thread in a cotton mill in Pennsylvania which he got $1.20 a week. He started to become wealthy when he started managing railroads. He made investments into ironworks which supplied union soldiers. In 1901, at age 66 Carnegie sold his steel company to JP Morgan for $487 million and retired as the richest man in America.