<P> Exports from 1914 to 1922 amounted to more than 200 million bushels . The annual wheat production of the United States more than tripled in the fifty years between 1871 and 1921; it increased from about 250 million bushels during the period of 1869--1871 to over 750 millions during the period of 1919--1921 . With recorded wheat production of more than its domestic consumption (production was as much as 2.5 times the consumption), as World War II started, wheat stocks could not be lifted and the result was its use as livestock feed and for industrial alcohol . After the war years, there were four "best" years (1945--1948) when the average annual production peaked to 1,228 million bushels, double the production of war years . </P> <P> In 2002, 50% of the U.S. wheat crop was exported, while 36% was consumed by the American population, and 10% was fed to livestock, with the remaining 4% set aside for seed . Wheat harvesting occurs on land area of 60--63 million acres . Genetically modified wheat, which "is not approved for cultivation anywhere in the world", was found in an Oregon farm in June 2013 . The grain was modified by Monsanto to tolerate weed killer treatments . It is not known whether the unapproved wheat is present elsewhere . </P> <P> In the North American plains, the axis which extends over a length of 1,500 miles (2,400 km) in a north - south direction from central Texas to central Alberta is known as the Wheat Belt . Hard red winter wheat is grown in the southern U.S. states of Kansas, Oklahoma, Texas, Nebraska, and Colorado . In the hot climatic conditions of these states, winter wheat is raised by planting in fall and harvesting in the spring . taking advantage of autumn rains . Under harsh cold weather conditions in parts of Montana, North Dakota, South Dakota, and Minnesota where winter wheat cannot be grown, the crop is planted in the spring and grows during the long summer days of the high latitudes so that it can be harvested in the fall . </P> <P> Of wheat grown in the United States, 36% percent is consumed domestically by humans, 50% is exported, 10% is used for livestock feed, and 4% is used for seedlings . Various American - style wheat beers are produced in the US . Wheat in the U.S. is grown under two major categories based on climate: winter wheat, and spring wheat . The majority is winter wheat, accounting for, on average, 75% of wheat production . Wheat may be further classified as follows: </P>

Where is wheat grown in the united states