In 2007, there will be 90,500,000 acres of corn alone grown in the U.S.
Natural cultivation does not even start to require the type of pollinization that U.S. agriculture needs.
Natural cultivation took in the whole of the US. Many more acres than are under cultivation today. Also, you ignored the Indians who grew crops, many, many acres of them before the Spanish wiped them out with diseases such as measles and small pox.
To think that honey bees are the only polinizers in the US, or on the planet, is just plain idiotic. Many crops were raised here in this country before honey bees were imported to the US also. How do you account for that? As I said, nature doesn't rely on one method to do a job. Crops will be pollinated.
Many insects besides bees pollinate crops.
For one thing ALL honey bees are not dead. Just two days ago an ER was shut down because a swarm of 7000 honey bees covered the ambulance entrance and they had to call a bee keeper to come get them.
I have hives near my home and the bees are just fine and thriving. As I said, this is the latest scrare tatic. If all else fails we can import bees to this country again, there are plenty in Europe, South America and Africa to draw from.
So take your head out from under the covers and stop quaking in fear, the problem(if one really exists) will be solved.