Why are American kids so spoiled?

"With the exception of the imperial offspring of the Ming dynasty and the dauphins of pre-Revolutionary France," Elizabeth Kolbert posits, "contemporary American kids may represent the most indulged young people in the history of the world." She explains:

It’s not just that they’ve been given unprecedented amounts of stuff—clothes, toys, cameras, skis, computers, televisions, cell phones, PlayStations, iPods. (The market for Burberry Baby and other forms of kiddie “couture” has reportedly been growing by ten per cent a year.) They’ve also been granted unprecedented authority. “Parents want their kids’ approval, a reversal of the past ideal of children striving for their parents’ approval,” Jean Twenge and W. Keith Campbell, both professors of psychology, have written. In many middle-class families, children have one, two, sometimes three adults at their beck and call. This is a social experiment on a grand scale, and a growing number of adults fear that it isn’t working out so well: according to one poll, commissioned by Time and CNN, two-thirds of American parents think that their children are spoiled.