There isn’t a single human characteristic that can be safely labeled “American.” There isn’t a single human ambition, or religious trend, or drift of thought, or peculiarity of education, or code of principles, or breed of folly, or style of conversation, or preference for a particular subject for discussion, or form of legs or trunk or head or face or expression or complexion, or gait, or dress, or manners, or disposition, or any other human detail, inside or outside, that can rationally be generalized as “American.” — Mark Twain, “What Paul Bourget Thinks of Us,” Collected Tales, Sketches, Speeches, & Essays, 1891-1910