Irrigation

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Article abstract: Irrigation permitted some tribes of the Southwest, particularly in prehistoric times, to practice effective agriculture in arid lands

Irrigation, the bringing of water to agricultural fields, was practiced widely in pre-Columbian Mexico and Peru, but it was used relatively little by prehistoric North American Indians. Most of eastern North America had adequate rainfall for agriculture, and much of western North America was so dry that agriculture was impractical. As a result, irrigation in pre-Columbian North America was restricted to the...

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