Irrelevant. There are dry counties in the states, but controlled by the state constitutions. The liquor prohibition at the fed level took an amendment to our Constitution.
The bogus assertions that local prohibitions are unconstitutional fails, so you switch to talking about federal prohibitions. Even that tired shell game fails.
The Anti-Saloon League and the Woman's Christian Temperance Union "oversaw the election of the two-thirds majorities necessary in both houses of Congress to initiate what became the Eighteenth Amendment to the Constitution of the United States."
The Anti-Saloon League sought a Constitutional Amendment because they felt it would be more difficult to repeal than legislation.
"An amendment to the Constitution obviously appealed to temperance reformers more than a federal statute banning liquor. A simple congressional majority could adopt a statute but, with the shift of a relatively few votes, could likewise topple one. Drys feared that an ordinary law would be in constant danger of being overturned owing to pressure from liquor industry interests or the growing population of liquor-using immigrants. A constitutional amendment, on the other hand, though more difficult to achieve, would be impervious to change. Their reform would not only have been adopted, the Anti-Saloon League reasoned, but would be protected from future human weakness and backsliding."
Repealing National Prohibition by David Kyvig, Copyright 1979 by the University of Chicago
"The day is unlikely to come when the eighteenth amendment will be repealed."
--President Warren Harding, 2nd Annual Message, December 8, 1922