Silk Hats in Fashion
Why did the fashion for silk hats in the U.S. lead to an increase in the number of small lakes and bogs?
Clue: The same environmental change would have occurred if felt hats or woolen hats had become very popular. More silk hats were sold and fewer other hats were sold. Fur hats were out of fashion.
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Answer: Because silk hats came into fashion, the demand for beaver hats decreased. More beavers meant more small lakes and bogs.