Final answer:
April 14, 1935 is called Black Sunday because it was the day a massive dust storm swept across the Great Plains.
Step-by-step explanation:
In the book 'Black Sunday: The Storm That Gave Us the Dust Bowl,' April 14, 1935 is called Black Sunday because it was the day a huge dust storm swept across the Great Plains. The storm was extremely severe and caused significant damage to both property and agriculture. The event marked a turning point in the Dust Bowl, as it led to increased awareness and efforts to mitigate the impacts of the environmental disaster.
Learn more about Black Sunday and the Dust Bowl