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Gartner's theory will no doubt raise eyebrows— and hackles— among historians and psychologists, not only because of turf wars, but because it asserts that the driving force behind the American temperament could be biological. Can you imagine fifth-grade social studies teachers instructing their students that many of our Founding Fathers had, well, psychological issues?

"It really is out of the box, way out of the box," says Gartner. "And yet when you start to examine the idea, it's like it was hiding in plain sight. When you really start to think about it, it's like, of course. Ah-ha."

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