Unit 5 The Sad Young Men背景介绍(3)

The Background In 1914 , World War I broke out in Europe .

In 1917 , the United States entered the war against Germany , which was defeated in 1918 . After the war , the United States's economy boomed , but prosperity did not last . A stock market crash in 1929 led to the Great Depression , a deep economic slump in the 1930's

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