The one-year clause makes the operational date distinct from the January 16, 1919 ratification date.
Official amendment text reproduced by the National Archives article.
“After one year from the ratification of this article the manufacture, sale, or transportation of intoxicating liquors within, the importation thereof into, or the exportation thereof from the United States and all territory subject to the jurisdiction thereof for beverage purposes is hereby prohibited.”
10
10
Eighteenth Amendment, section 1
Checked against the reproduced amendment text.
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