Answer:
The main idea of the passage is that the southern Great Plains of the United States experienced severe droughts and dust storms in the 1930s and again in the 1950s, but the extent of the damage was less in the latter decade due to efforts to restore prairie grasses and prevent soil erosion. The passage also mentions the impact of the dust storms on farmers and the population in the affected region, including poverty and health problems.
Step-by-step explanation: