The completion of the paragraph is: Crops failed in the Southern part of the country when dry weather caused extreme dust storms in the 1930s.
This refers to the period of drought in the United States during the 1930s that led to severe drought.
Hence, we can see that this Dust Bowl was very severe to the extent that there were high winds and great dust that were choking the areas of Nebraska to Texas.
Read more about the Dust Bowl here:
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