Many states once set their minimum drinking-age at 18.
许多州曾把最低饮酒年龄设在18岁。
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But in 1984 Ronald Reagan oversaw the passage of the "21 law", which requires states to set 21 as the minimum drinking-age or risk losing 10% of their highway funds.
In 1990, in an attempt to reduce alcohol consumption and thereby to reduce alcohol-related traffic deaths among Berinians under 21, the legal drinkingage was raised to 21.