Why the US has won

The director of the Tour de France sums it up.  He may be talking about Lance Armstrong, but, it fits in world domination also. 

"It's an improvement in the method of approaching the Tour de France -- more professional, more rigorous, more methodical," race director Jean-Marie Leblanc said. "In a word, more American."

Americans just work harder.  That is why we win.  It isn't magic.