Prohibition
Prohibition in the United States focused on the manufacture, transportation, and sale of alcoholic beverages; however, exceptions were made for medicinal and religious uses. Alcohol consumption was never illegal under federal law. Nationwide Prohibition did not begin in the United States until January 1920, when the Eighteenth Amendment to the U.S. Constitution went into effect. The 18th amendment was ratified in 1919, and was repealed in December 1933 with the ratification of the Twenty-first Amendment.
History of California wine
The destruction of the American wine industry would come not from "phylloxera" but from Prohibition in the United States. Thirty-three states had gone dry at the outbreak of World War I. Wartime Prohibition was enacted in 1919, followed by the Volstead National Prohibition Act and the 18th Amendment to the U.S. Constitution in 1920, forbidding the "manufacture, sale, or transportation of intoxicating liquors."