A properly-ratified amendment cannot be overturned, unless it decreases a state's share of the votes in the Senate without its consent. There are at least two

A properly-ratified amendment cannot be overturned, unless it decreases a state's share of the votes in the Senate without its consent. There are at least two reasons prohibitionists sought an amendment: 1) The Supreme Court at the time did not take the expansive view of the Commerce Clause that it has today, so it may very well have declared a federal prohibition law unconstitutional. 2) The amendment didn't give Congress the power to ban alcohol, it banned alcohol. That meant that legalizing alcohol required another amendment. This was a huge win for the prohibitionists.