Answer:
Various factors have helped the Prairies to become the ?Granaries of the World?. Cereal- farming started here on a large scale after the 1840s. i.e. when the steel ploughs started to be used for digging here. The soil found here is rich in humus and fertile-the soil is known as Chernozem soil. Wheat, barley and oats are grown commercially in these areas. The use of modern agricultural machines such as tractors, harvesters and combines help the farmer with little help to do all the work. A good network of rail and ports help in the transportation and export of agricultural produce to distant countries.
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