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He was a Canadian-American railroad executive. He was the chief executive officer of a family of lines headed by the Great Northern Railway, which served a substantial area of the Upper Midwest, the northern Great Plains, and Pacific Northwest. He was born in September 16, 1838 in Eramosa Township, Ontario, Upper Canada. He is known during his lifetime as "The Empire Builder". The Industry that makes him rich is railroad.
https://en.wikipedia.org/wiki/James_J._Hill

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He is born July 8, 1839 and died in May 23, 1937. He was born in Richford, New York, U.S. He was an American oil industry business magnate and philanthropist. He is widely considered the wealthiest American of all time and the richest person in modern history. He got rich because of oil industry.
https://en.wikipedia.org/wiki/John_D._Rockefeller

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was an American financier and banker who dominated corporate finance and industrial consolidation in late 19th and early 20th Century United States. He is born in April 17, 1837 and died in March 31, 1913. He was born in Hartford, Connecticut, U.S. Morgan has been described as America’s greatest banker. He got rich by financing railroads and helped organize U.S. Steel, General Electric and other major corporations.
https://en.wikipedia.org/wiki/J._P._Morgan

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James Dunsmuir was a British Columbian industrialist and politician. Son of Robert Dunsmuir, he was heir to his family's coal fortune. He was born in July 8, 1851. He is from , Fort Vancouver,  WA.  Dunsmuir managed his family's coal business from 1876 until 1910 increasing profits and violently putting down efforts to unionize. The Industry that makes him rich is coal mining.
https://en.wikipedia.org/wiki/James_Dunsmuir

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He 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. He is born in August 10, 1821. Cooke was born at Sandusky, Ohio, the son of Eleutheros Cooke and Martha Carswell Cooke. He is the creator of the first wire house firm which makes him rich. 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. https://en.wikipedia.org/wiki/Jay_Cooke