Question

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

Answer 1

Definitely A Farmers' failure to use steam tractors and other modern equipment

Answer 2

The Anwser is the Letter A