Are British women happier than American women?

I may have missed the point of Saturday's New York Times column about Britain's new "national happiness index," but the part that most interested me was the British research mentioned that found "women tend to be happier than men." Huh? I always assumed men were happier than women ... they make more money, have less socially unacceptable body hair to contend with, grow more attractive with age... I thought that's why they fall asleep faster -- nothing but visions of sugarplums dancing in their heads.

A quick Google search confirmed my suspicion -- with regard to Americans. So how have our sisters across the pond achieved the upperhand when it comes to happiness? A few theories:

• Uniformed schoolgirls learn about role models like Elizabeth I and Margaret Thatcher -- without the distraction of dressing themselves in the hottest fashions every morning.
  
• Although the UK has a similar salary gap, British ladies can at least admire the likeness of their gender when parting with their hard-earned cash.
  
• While their lack of grooming and dieting obsessions might offend American men, this doesn't seem to bother British women much.