All of the following contributed to the Dust Bowl of the 1930s except a farmers' failure to use steam tractors and other modern equipment. b soil erosion. c dry-farming techniques. d unprecedented drought

All of the following contributed to the Dust Bowl of the 1930s except a farmers' failure to use steam tractors and other modern equipment. b soil erosion. c dry-farming techniques. d unprecedented drought and wind storms of the trans-Mississippi Great Plains. e the cultivation of marginal farmlands on the Great Plains

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