From the famed Jay Cooke & Co. Blank with fancy text and decoration. Jay Cooke is credited with financing the Civil War. The Jay Cooke bank lent the State of Pennsylvania $3 million at the outbreak of the war to finance its war efforts. He organized other financiers to lend money to the governments, eventually raising about $2.2 billion dollars. Among the earliest of American mega financiers, this check is drawn on his account.