In the United States,the average length of expansions from 1950 to 2009 was more than twice as long than they were from 1900 to 1950.

Name: In the United States,the average length of expansions from 1950 to 2009 was more than twice as long than they were from 1900 to 1950.
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According to historical data, the average length of expansions from 1950 to 2009 was about 5 years, while the average length of expansions from 1900 to 1950 was about 2 years, making the statement true.

In the United States,the Average Length of Expansions from 1950