It should be noted that the central idea regarding the World War II was developed as it was stated that it led to a great desire for consumer goods.
A central idea simply means the main idea that is in a story. It's simply what the author wants the readers to know.
In this case, the author developed the idea that World War II created positive change in the United States as it led to a great desire for consumer goods.
In conclusion, this brought a positive change to the economy.
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