Howard Kerr said this quote
“ (W.D.) Howells asserted that the Americans' 'love of the supernatural is their common inheritance from no particular ancestry.' Their fiction, he added, often gathers in the gray 'twilight of the reason,' on 'the borderland between experience and illusion. Howells's geographical metaphor was derived, of course, from Hawthorne's idea of a moonlit 'neutral territory, somewhere between the real world and fairy-land, where the Actual and the Imaginary may meet, and each imbue itself with the nature of the other.' Whether literally, as in Cooper's The Spy, or metaphorically, as in Hawthorne's works, the neutral territory/borderland was the familiar setting of the American romance. As American writers came to realize, not only was there a borderland between East and West, civilization and wilderness, but also between the here and the hereafter, between conscious and unconscious, 'experience and illusion' - psychic frontiers on the edge of territories both enticing and terrifying. ”