In 1919, during the Prohibition period, alcohol was banned in the United States with the passage of the 18th Amendment to the United States Constitution. But in 1933 the 21st Amendment to the U.S. Constitution repealed the 18th Amendment, and gave states the power to enact their own laws regarding the production, distribution, and sale of alcohol.
Today, each state—and in some cases, each municipality or county—has its own regulations regarding the sale and shipment of all alcoholic beverages. When shipping alcohol across state borders, both the law of the state from which the shipment is made and the law of the state in which it is received are relevant. And the commercial carriers such as UPS, FedEx, and DHL only ship alcohol to and from licensed manufacturers, distributors, sellers, and importers.