At least 13 that I can find, including field corn, sweet corn, soybean, cotton, rapeseed, rice, tomato, eggplant, cabbage, broccoli, coffee, poplar, and Loblolly pine. Within each species there may be many different varieties which carry the Bt genetic trait.
corn and cotton
apples
According to the American Farm Bureu (Food and Farm Facts 2009) and the USDA the top five US agricultural products are Cattle and calves, Dairy Products, Corn, Broilers and Soybeans.
Drugs, chemicals, airplanes from Boeing, machinery, computers, agricultural products, Clothing brand, vehicles and many more.
The types of agricultural goods that the US imports are, tobacco, wheat, rice, and cotton. The types of products that the United States imports include a variety of fruits and vegetables.
In general terms:Canada: manufactured goods, industrial machinery, agricultural products and some fuels such as crude petroleum and natural gas.United States: capital goods, industrial supplies, consumer goods, agricultural products.Mexico: manufactured goods, oil and oil products, raw materials, agricultural products.
It has increased it. Due to the fact that most agricultural products are heavily subsidized in the US, Mexico has been flooded with these products. This in turn puts many farms out of business, and former peasants and agricultural workers have to find alternatives; the most common include migrating into the cities, and looking for jobs in the US, even as illegal immigrants.
To allow American industries to grow..
Citrus, Pineapples, fruit and vegetables, cotton, tobacco, rice, corn,
textiles and ready-made garments, Internet-enabled services, agricultural and related products, gems and jewelry, leather products, and chemicals.
In 2007, the most recent US Census of Agriculture year, there were 2,204,792 farms in the US. For Census purposes, a farm was defined as any place where $1000 or more of agricultural products were grown and sold in the course of the year.
Livestock, cotton, corn, soybeans, wheat, alfalfa, hay, tobacco, rice, barley, and sorghum.