Largest Cash Crop: Marijuana

U.S. growers produce nearly $35 billion worth of marijuana annually according to a recent report, making the illegal drug the country's largest cash crop, bigger than corn ($23 billion) and wheat ($7 billion) combined.

Only prohibition and the drug war's distortion of the laws of supply and demand make an easily grown weed worth as much as gold. If growing wheat was illegal and there was a "war on wheat," wheat would probably be worth a lot more than $5 per bushel.