According to the text the way that history develops is that it shows the mistakes that have been done in the past and how they are not to be commited in the future.
The inferences that were made from the text
There wwere young people that went on a period of merry making in the US after world war 1, while there were others that committed to the building of the country.
The passage is talking about the mistakes of the past and how they can be avoided in the future.
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