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J.P. Morgan was born April 17, 1837, Hartford, Connecticut, U.S. and died March 31, 1913, Rome, Italy. J.P Morgan was born into wealth and went to school in Boston and at the University of Göttingen. He was mostly involved in financing where he gain almost all of his wealth. In the year 1871 Morgan became a partner in the New York City firm of Drexel which turn out to be the best decisions he ever made.Soon after this he became the predominant source of U.S. government financing which earn him a lot of wealth
Sources
https://www.britannica.com/biography/J-P-Morgan

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Leland Stanford was born March 9, 1824, Watervliet, New York, U.S. and died June 21, 1893, Palo Alto, California. Leland Stanford was one of the first to build part of the transcontinental railroad. Stanford also practiced law Port Washington in Wisconsin before moving to California where he spent the remainder of his life. He achieved much success in retailing mining supplies and other general merchandise. He later became involved in politics then later became a republican senator.
Sources
https://www.britannica.com/biography/Leland-Stanford

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John D. Rockefeller was born July 8, 1839, Richford, New York, U.S.and died May 23, 1937, Ormond Beach, Florida. He was and american industrialist and founder of the Standard oil company. Johns company dominated the oil business and at one point the only seller of oil. He was best known to caused some industrialized states to enact anti monopoly laws. It also led to the U.S congress to pass the Sherman antitrust act.
Sources
https://www.britannica.com/biography/John-D-Rockefeller

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Charles Crocker was born Sept. 16, 1822, Troy, N.Y., U.S. and died Aug. 14, 1888, Monterey, California. Charles grew up in a poor family which forces him to quit school at an early age to help support his family. He and his family lived in Indiana until he and his brothers Clark and Henry migrated overland to California when gold was discovery there. He soon got his big break when he got in possession of railroad company. He was responsible for build the western portion of the first American transcontinental railroad.

Sources https://www.britannica.com/biography/Charles-Crocker

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John Jacob Astor was born July 17, 1763, Waldorf, Ger. and died March 29, 1848, New York, N.Y., U.S. He gain his fortune from shrewd dealings with Indian tribes he amassed 250,000 dollars and become the leading figure in the fur trade. His company, American fur company was considered the first ever monopoly. His son later expanded on his success. William Astor build 700 more stores and dwellings.
Sources
https://www.britannica.com/biography/John-Jacob-Astor-American-businessman-1763-1848