It would be amendment number twenty one, the repeal of prohibition.
The twenty-first amendment nullifies the eighteenth amendment.
The 21st Amendment (1933) repeals the 18th amendment banning alcohol from being distributed.
The 21st Amendment to the US Constitution specifically repealed the 18th (Prohibition of alcohol).
The 21st amendment repealed prohibition and voided the 18th Amendment (the only amendment to repeal another amendment).
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