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According to this site, http://www.ttb.gov/public_info/special_feature.shtml, the Whiskey Tax was repeal in 1802.
The 21st amendment repeals the 18th amendment in 1933, and today we call the period that the 18th Amendment was law Prohibition. The 18th amendment was not always unpopular. In fact, some states had already banned alcohol before the 18th amendment.