Answer :

The answer to this question is that the the increase in the amount of time that drug offenders are expected to serve is the greatest contributor because of which the federal prison population has grown significantly since the 1980s.

The federal prison population increased more, according to the Urban Institute,  was due to the drug offenders' increased predicted time served  more than any other factor.

More individuals are imprisoned in the United States than any other country in the world. In the last 40 years, the number of Americans incarcerated has climbed by 500%.

In the same period, crime rates haven't risen proportionately. Instead, the sharp rise in prison populations can be attributed to legislative and regulatory developments that are directly related to the disproportionate influence of racism and race in American society.

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