The USDA has just released the latest figures on planting of genetically modified soybeans, corn, and cotton in the United States. GM varieties comprise 60-70 percent of all corn and cotton, and 90 percent of soybeans. On this basis, if a food containing corn or soybeans is not labeled Certified Organic or GM-free, you should assume it is GM.
Soybeans and cotton genetically engineered with herbicide-tolerant traits have been the most widely and rapidly adopted GE crops in the U.S., followed by insect-resistant cotton and corn.