Are Americans getting smarter?

The number of cars with "My son is an honor student at XXX school" bumper stickers seems to be multiplying exponentially. Also--and I admit this is anecdotal evidence--I never seem to hear a young person discussed without assertions that he or she gets nothing but As and Bs.

Are our children getting smarter? Has our educational system improved to the point where everyone is fulfilling his or her potential to the max? Can we rest confident that America's future is in the hands of these budding geniuses?

Or is there a new definition of honor student--someone who attends school most of the time, gives the teachers no lip and doesn't burn the building down?

In Alice in Wonderland there is a dodo race. Everyone runs around aimlessly wherever he wants to, and at the conclusion, everyone wins and gets a prize. Is this the model for the American education system?