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Jay was born in OH, Sandusky in 1821. Jay was a financier that helped finance the Union war. This helped the union soldiers with supplies and being payed after the war. He is known as the creator of the first wire house firm. Also as the first major investment banker in the U.S. He also helped finance the postwar development of the railroads. https://en.wikipedia.org/wiki/Jay_Cooke

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Charles was born in NY, Troy  in 1822. Charles founded the Central Pacific Railroad and was a railroad executive. Central Pacific Railroad built the first portion of the transcontinental railroad. It also took control of the southern pacific railroad. Charles was also part of "the big four".https://en.wikipedia.org/wiki/Charles_Crocker

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Stanford was born in New York, Watervilet in 1824. Stanford was founder of the Stanford university. In 1861 he spent 2 years as governor of California. There was a  group named "the big four" and Stanford was part of the 4. He also was the president of the Central Pacific Railroad. https://en.wikipedia.org/wiki/Leland_Stanford

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Andrew Carnegie was born in United Kingdom in 1835. In the late 19th century Andrew led a steel industry. He became one of the richest people, he gave away 350 million to charity. Andrew passed Rockefeller as the richest man for a couple years.  In today he is the 2nd richest figure. https://en.wikipedia.org/wiki/Andrew_Carnegie

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Rockefeller was born in NY, Richford in 1839. At the time Rockefeller was the richest figure with 336 billion.  Rockefeller worked in the oil industry and became rich when oil was needed. He controlled 90% of the country's oil. Rockefeller was the first billionaire of the country.
https://en.wikipedia.org/wiki/John_D._Rockefeller