Corn and Irrigation

"These ancient Peruvians lived in simple adobe houses, cultivated potatoes and beans, fished in the nearby sea, and grew and wove cotton for their clothing. The catalyst for the development of the more advanced civilizations that followed was the introduction of a staple annual crop- maize (corn), and the development of irrigation, both dating from around the thirtieth century B.C. The stabilization of the food supply and ensuing surplus formed the foundation for the development of the great civilizations that rose and fell across the Andes Mountains for more than a thousand years prior to the arrival of the Europeans."

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