Why does the term "lost generation" refer to those that lived through or came of age between 1914 and 1932?

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By "Lost Generation" is meant those who lived a large part of their lives disturbed by the evils of the early twentieth century. The term is attributed to Gertrude Stein and was used by Hemingway in his works. These individuals, who lived through this time, had to fight the First World War (in different ways) and face the Great Depression. A cultural, political and financial failure.
 
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