It would seem that marijuana is the United State's biggest cash crop.
edit: That article estimates 24,000 metric tons of marijuana was available for sale in the United States 2001-ish, though not all of that would have been grown here. This page says 228,805,000 metric tons of corn was grown in the US 2002/2003. Grrr, I want to find a volume comparison, not just weight.
edit: That article estimates 24,000 metric tons of marijuana was available for sale in the United States 2001-ish, though not all of that would have been grown here. This page says 228,805,000 metric tons of corn was grown in the US 2002/2003. Grrr, I want to find a volume comparison, not just weight.