How did world war one the 18th amendment get ratified?

On November 18, 1918, before the ratification of the Eighteenth Amendment, the United States Congress passed the temporary Wartime Prohibition Act, which banned the sale of alcoholic beverages having an alcohol content of greater than 2.75%.This act, which was intended to save grain for the war effort, helped in the

Congress passed the temporary act limiting alcohol to 2.75% in order to save on grain during the war.