In the 1930s, what was the main result of settlers modifying the environment in the Great Plains for farming?

Settlers plowed up native prairie grasses to create farmland, leaving the soil exposed when severe drought struck in the 1930s. Wind then carried away the dry topsoil, causing the Dust Bowl and making much of the land difficult to farm. So the main result was that extended drought led to a massive dust bowl that made the land unproductive.

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