US wheat production has increased dramatically since 1866, from 170 million bushels to 2.4 billion bushels in 2008. Acres planted have risen from 15.4 million to 56.6 million over the same period, while yields per acre have increased from 11 bushels to 43.5 bushels. Wheat was first cultivated 12,000 years ago in Iraq, Iran and Jordan, and spread to other parts of the world like Ethiopia, Great Britain and Spain around 5,000 years ago. Winter wheat was brought to the US by Russian Mennonites in 1874. There are different classes of wheat defined by attributes like hardness, color, growing habit. The milling process separates wheat into bran,