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Jay Cooke was an American financier who helped finance the Union war effort during the American Civil War and the postwar development of railroads in the northwestern United States. Jay Cooke was a prominent banker in the United States and a principal financier of the Union military effort during the American Civil War. Cooke was born on August 10, 1821, in San dusky, Ohio. He was named for John Jay, the first Chief Justice of the United States Supreme Court.

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J.P. Morgan was an American financier and banker who dominated corporate finance and industrial consolidation in late 19th and early 20th Century United States. Morgan financed railroads and helped organize U.S. Steel, General Electric and other major corporations. Morgan bought out Andrew Carnegie and set up the first billion-dollar corporation, U.S Steel. He controlled the economy with the assets invested in his financial empire.

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John D. Rockefeller was an American oil industry business magnate and philanthropist. Rockefeller is widely known as the richest person in modern history with a net worth with $336 billion. Rockefeller built an oil monopoly by ruthlessly eliminating most of his competitors. This made him the richest man in the world. But he spent his retirement years giving away most of his money.

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Andrew Carnegie was a Scottish-American industrialist who led the expansion of the American steel industry in the late 19th century. Carnegie donated large amounts of money to educational, cultural, and scientific institutions. Carnegie donated over $350 million dollars. He is is also the second wealthiest figure of modern time with a net worth of $310 billion. Carnegie had over 2,500 libraries build from money donated from him.

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Amasa Leland Stanford was an American tycoon, industrialists, politician, and the founder of Stanford University. Stanford is most famous for building a successful retail business in mining supplies and became active on local politics. Later becoming Governor of California form 1861 to 1863. He later invested in the building of Central Pacific Railroad and became the president of it.