Sarah Churchwell @sarahchurchwell is Chair of Public Humanities, American Literature Professor at the School of Advanced Study, University of London.
John Prideaux @JohnPrideaux is U.S. editor at The Economist.
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Producer: Dan Morelle
Part 1 of Dan Snow's new 3-part series, Operation Gold Rush is available to stream on iPlayer now and continues this Sunday on BBC Two at 9pm.