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Charles was born on June 25th, 1837. Yerkes was an American financier syndicate of companies that later made Chicago's mass-transit system. In 1901 he sold his interests in the overburdened streetcar . He also gave funding to an observatory.
https://www.britannica.com/biography/Charles-Tyson-Yerkes

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Mark was born September 3rd, 1814. Hopkins was an California capitalist who helped build the Central Pacific Railroad. Most of his businesses were in Sacramento. Later he went on to build his magnificent mansion.
https://www.britannica.com/biography/Mark-Hopkins-American-businessman

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Cornelius was an American shipping and railroad magnate. He acquired a personal fortune of  more than 100 million. He started a ferry business and later gained control with wages and fees towards the people. He earned his wealth on many different jobs.
https://www.britannica.com/biography/Cornelius-Vanderbilt-1794-1877

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John was born on July 8th, 1839. Rockefeller was an American industrialist and philanthropist. Also, John was the founder of The Standard Oil Company, which dominated the oil industry. By 1882 Standard Oil had a near monopoly on the oil business.
https://www.britannica.com/biography/John-D-Rockefeller

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Leland was born on March 8, 1893. Stanford was a U.S Senator from California. He was also one of the builders for the Transcontinental Railroad. He was active in politics but still achieved much success in retailing mining supplies and general merchandise. It was in California where he gained his riches.
https://www.britannica.com/biography/Leland-Stanford