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After the war, Cooke became fascinated in in the making of of the northwest, and in 1870 his firm financed the construction of the Northern Pacific Railway. around the time of 1880, Cooke had had met all his financial obligations, and through an investment in the Horn Silver Mine in Utah, had again become wealthy.He died in the Ogontz (now Elkins Park) section of Cheltonham Township of, Pennsylvania , on February 16, 1905.

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In 1838, Cooke had traveled to Philadelphia, where he entered the the banking house of E.W. Clark & Co. as a clerk, and became a partner in 1842. He left this firm in 1858. On January 1, 1861, just months before the start of the Civil War, Cooke opened the private banking house of Jay Cooke & Company in Philadelphia. Soon after the war began, the state of Pennsylvania borrowed $3,000,000 to fund its war efforts.

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Born on August 12,1821, at Sandusky, OH to Eleutheros and Martha Cooke, Cooke. His father was was a pioneer Ohio lawyer and Whig, a member of the Ohio General Assembly and member of Congress from Ohio in 1831-1833.

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A financier who helped finance the Union War effort during the American Civil War and the postwar development of railroads in the northwestern United states