The minimum legal drinking age (MLDA) in the United States (U.S.) has raised debate over the past several decades. During the 1970s many states lowered their MLDAs from age 21 to 18, 19, or 20. However, as a result of studies showing that these lower MLDAs were associated with increases in traffic crashes, state-level movements began in the later1970s to return MLDAs to age 21. A new movement has arisen to again lower the MLDA in the U.S.
The aim is to discuss this current MLDA debate within the context of the long history of the U.S. MLDA.
The complexity of state movements to change their MLDAs is illustrated by the Michigan experience, where strong political forces on both sides of the issue were involved, resulting in the MLDA returning to 21. Because the 21st Constitutional amendment prevents the federal government from mandating a MLDA for all states, a federal policy was proposed to provide incentives for all states to implement age-21 MLDAs. Due largely to strong research evidence, the National Minimum Legal Drinking Age Act was enacted in 1984, stipulating that states set their MLDA to 21 or face loss of federal highway funds. By 1988, all states had an age-21 MLDA.
Any current debate about the MLDA should be informed by the historical context of this policy and the available research.
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