The US legal-drinking age has had a winding history. In the early 1970s, 29 states lowered their legal drinking age to 18, 19or 20. But after a rise in drunk-driving crashes among young people, many states began to reverse course. A change in federal law eventually pushed all states to adopt a minimum drinking age of 21 by 1988. But in recent years, the benefits of the age-21 law have been challenged. In 2006, a non-profitcalled Choose Responsibility started campaigning for a change in the federal law. Two years later, a group of more than 100 US university presidents and chancellors known as the Amethyst Initiative called for a re-evaluation of the legal drinking age—citing a “clandestine” culture of heavy drinking episodesamong college students as one reason that the age-21 law is not working. Those moves grabbed a lot of media attention, and public health experts responded by launching new studies into the impact of the drinking-age law. Based on DeJong’s review, that research supports what earlier work had shown.