Why does agriculture thrive in the Great Plains of North America?

The Great Plains is the most productive dryland wheat area in the world, and pivotal to world grain supplies (Riebsame 1990). Great Plains production accounts for 51% of the nation's wheat, 40% of its sorghum, 36% of its barley, 22% of its cotton, 14% of its oats, and 13% of its corn.

Explanation:

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