The main idea of the passage is that

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Answer the questions that follow this passage.  There is some evidence that crime rates are linked to social trends, such as demographic and socio-economic changes. Crime statistics showed a decline in the post-World War II era of the 1940s and '50s. Following the Vietnam War in the 1970s, however, reported crimes were on the rise again, only to be followed by lower numbers of such reports in the 1980s. One of the reasons for these fluctuations appears to be age. When the population is younger, as in the 1960s when the baby boomers came of age, there is a greater incidence of crime... Show more

The main idea of the passage is that