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Extensive farming combined with severe drought caused the Dust Bowl in the 1930s. Deep plowing on the Great Plains killed the natural grasses that kept soil in place, and the topsoil turned to dust and blew away.
Confidence votes 79. The main causes of the dust bowl were extreme drought for eight years in total, and also very poor farming techniques on the behalf of the inhabitants. Normally crops are rotated (different crops are grown in an area each year or sometimes no crops at all) so as to never deplete soil too much.