Of all the great postwar inventions--television, rock 'n' roll, the Internet--the greatest and most influential is, perhaps, the American teenager. Think about it. While the country has always had adolescents (human beings between the ages of 12 and 18, that is), it was only in the past 50 or 60 years that it had tens of millions of semi-grownups living in a developmental buffer zone somewhere between childish innocence and adult experience.
This teenage culture of pop songs, cars and acne ointments, of proms, allowances and slumber parties is still unknown in less developed countries. And until the reform of child-labor...