The repeal of prohibition by the 21st Amendment on Dec. 5, 1933 allowed each state to set its own alcohol consumption laws. At that time, most states established the minimum legal drinking age (MLDA) for alcohol at 21 years of age.
Following the July 1, 1971 passage of the 26th Amendment, which lowered the legal voting age from 21 to 18 years of age, 30 US states lowered their MLDA to 18, 19, or 20. By 1982, only 14 states still had an MLDA of 21.
The enactment of the National Minimum Drinking Age Act of 1984 forced states to raise their legal age for purchase or public possession of alcohol to 21 or risk losing millions in federal highway funds. By 1988, all 50 states had raised their MLDA to 21.
California (1933) and Oregon (1933) have the nation’s oldest MLDA 21 laws, while South Dakota (Apr. 1, 1988) and Wyoming (July 1, 1988) have the most recent MLDA 21 laws.
The charts below show the date on which the MLDA 21 laws became effective in each state.
StateDate MLDA Was AdoptedAlabama1985 (Oct. 1)Alaska1984 (Nov. 1)Arizona1985 (Jan. 1)Arkansas1935California1933Colorado1987 (July 1)Connecticut1985 (Sep. 1)Delaware1984 (Jan. 1)Florida1985 (July 1)Georgia1986 (Sep. 30)Hawaii1986 (Oct. 1)Idaho1987 (Apr. 10)Illinois1980 (Jan. 1)Indiana1934Iowa1986 (Sep. 1)Kansas1985 (July 1)Kentucky1938Louisiana1987 (Mar. 15)Maine1985 (July 1)Maryland1982 (July 1)Massachusetts1985 (June 1)Michigan1978 (Dec. 21)Minnesota1986 (Sep. 1)Mississippi1986 (Oct. 1)Missouri1945Montana1987 (Apr. 1)Nebraska1985 (Jan. 1)Nevada1935New Hampshire1985 (June 1)New Jersey1983 (Jan. 1)New Mexico1934New York1985 (Dec. 1)North Carolina1986 (Sep. 1)North Dakota1936Ohio1987 (July 31)Oklahoma1985 (Nov. 1)Oregon1933Pennsylvania1935Rhode Island1984 (July 1)South Carolina1986 (Sep. 14)South Dakota1988 (Apr. 1)Tennessee1984 (Aug. 1)Texas1986 (Sep. 1)Utah1935Vermont1986 (July 1)Virginia1985 (July 1)Washington1934West Virginia1986 (July 1)Wisconsin1986 (Sep. 1)Wyoming1988 (July 1)Sources:
1. American Medical Association (AMA), “Minimum Legal Drinking Age,” www.ama-assn.org (accessed Oct. 27, 2011)
2. Preusser Research Group, “Determine Why There Are Fewer Young Alcohol-Impaired Drivers,” National Highway Traffic Safety Administration website, Sep. 2001
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The Congress passed the National Minimum Drinking Age Act in 1984, establishing 21 as the minimum legal purchase age.
Since then:
Drinking by high school seniors has fallen substantially — from 66% to 42% (see chart). During this same period, binge drinking by high school seniors — that is, having five or more drinks on an occasion — has fallen from 37% to 24%.
Despite these improvements, too many teens still drink.
In 2012, 42% of 12th graders, 28% of 10th graders, and 11% of 8th graders, reported drinking alcohol in the past 30 days. That same year, about 24% of 12th graders, 16% of 10th graders, and 5% of 8th graders, reported binge drinking in the last two weeks.
Why did Congress pass the national drinking age act?
After Prohibition, nearly all states adopted a minimum legal drinking age (MLDA) of 21. Between 1970 and 1975, however, 29 states lowered the MLDA to 18, 19, or 20, largely in response to the change in the voting age. Studies conducted at the time showed that youth traffic crashes increased as states lowered their MLDA. In addition, the "blood borders" between states with different MLDAs caught public attention after highly-publicized crashes in which youth below the legal drinking age would drive to an adjoining state with a lower MLDA, drink legally, and crash on their way home.
Advocacy groups urged states to raise their MLDA to 21. Several did so in the late 1970s and early 1980s, but others did not. To encourage a national drinking age, Congress enacted the national MLDA. A review by the U.S. General Accounting Office, conducted in 1988, found that raising the drinking age reduced youth drinking, youth driving after drinking, and alcohol-related traffic accidents among youth.
Is the legal drinking age still important?
Yes. Injuries from teen drinking are not inevitable, and reducing teen access to alcohol is a national priority.
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September 2013