The central idea of the passage is that Prohibition was implemented by the United States in order to curtail the drinking of alcohol.
The evidence that supports the curtail of alcohol was the fact that the legislation was included in the Constitution and in federal law.
It should be noted that a piece of evidence that would support the argument is a list of measures that other countries have taken regarding alcohol consumption.
A way in which the process that was discussed in the passage compares with earlier reform movements is the persistence of the people who encouraged reform.
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