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Agriculture is a major industry in the United States and the country is a net exporter of food. As of the last census of agriculture in 2007, there were 2.2 million farms, covering an area of 922 million acres, an average of 418 acres per farm. Although agricultural activity occurs in most states, it is particularly concentrated in the vast expanse of flat, arable land known as the Great Plains, which encompasses the central region of the nation. (via Freebase)