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Leland Stanford was born on March 9, 1824. He was an American tycoon, industrialist, politician, and a co-founder. He became president of Southern Pacific Railroad in 1861. He was known as one of the "Big Four" of the Transcontinental Railroad. He was politically active and became a leader of the Republican Party.

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Mark Hopkins was born on Feb. 4, 1802 in Stockbridge, Mass. After graduating from college, Mark became a Moral Philosophy and Rhetoric professor. From 1836- 1872, he became the president of Williams College. He married a woman named Mary Hubble in 1832. Mark and Mary had ten children.

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Henry Clay Frick was born on December 19 1849 in West Overton, Westmoreland County, Pennsylvania. He created a coke and steel business. He was an industrialist, art collector, and philanthropist. In the formation of the United States Steel Corporation, he played a big role of that. Later, he became a director and also became director of many railroads.

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Andrew Carnegie was born on November 25, 1835. The American steel industry in the late 19th century was one of his enormous expansion. He was born in Dunefermline, Scotland. He was also known as one of the richest men. Carnegie was also one of the first businessmen to gain fortune during industrialization.

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John D. Rockefeller was born on July 8, 1839 in upstate New York. He grew up as a son of the traveling salesman. He built his Standard Oil Company in Ohio. His company controlled 90% of the Industry. He bought out competition  and was able to raise prices above normal levels.