is the drinking age 21 in all us states
The alcohol laws of the United States regarding minimum age for purchase have changed over time. The history is given in the table below. Unless otherwise noted, if different alcohol categories have different minimum purchase ages, the age listed below is set at the lowest age given (e.g. if the purchase age is 18 for beer and 21 for wine or spirits, as was the case in several states, the age in the table will read as ``18'', not ``21''). In addition, the purchase age is not necessarily the same as the minimum age for consumption of alcoholic beverages, although they have often been the same.
U.S. history of alcohol minimum purchase age by state