If you lived at Downton Abbey, you shopped at Selfridge's. Harry Gordon Selfridge was a charismatic American who, in twenty-five years working at Marshall Field's in Chicago, rose from lowly stockboy to a partner in the business which his visionary skills had helped to create. At the turn of the twentieth century he brought his own American dream to London's Oxford Street where, in 1909, with a massive burst of publicity, Harry opened Selfridge's,...