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Andrew Carnegie was a Scottish-American industrialist. Carnegie led the expansion of the American steel industry in the late 19th century and is often identified as one of the richest people ever. He is the second most richest person ever, with a net worth of 310 billion. Before the government created all kinds of laws for businesses, Carnegie had also bought out his suppliers and competitors like many others.

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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. Cooke was born at San dusky Ohioh, the son of Eleutteros Cooke and Martha Carswell Cooke. Eleutheros Cooke was a pioneer Ohio lawyer and Whig, a member of the Ohio General Assembly and member of Congress from Ohio in 1831-1833. Cooke's own firm was so successful in distributing Treasury notes that Chase engaged him as special agent to sell the $500 million in "five-twenty" bonds — callable in five years and matured in 20 years — authorized by Congress on February 25, 1862. The Treasury had previously tried and failed to sell these bonds.

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James Fisk a.k.a. "Big Jim", was an American stockbroker and corporate executive. He also became friends with President Ulysses S. Grant. He went in control over the Railroad with Jay Gould. Someone named stokes confronted Fisk at a Grand Hotel and killed Fisk out of frustration.

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John D. Rockefeller is a bushiness man in the oil industry in the U.S. He built his first oil refinery near Cleveland 1870 called the Standard Oil Company. He bought out his suppliers and competitors to be the most dominant in the oil business. Because of this, the government created the Sherman act to prevent this from happening.

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John Jacob Astor was a German American businessman. He also was a merchant and real estate mogul. John was a investor who mainly made his fortune in fur trade and by investing in real estate in or around New York City. builder, investor, inventor, writer, lieutenant colonel in the Spanish–American War, and a prominent member of the Astor family.