The National Minimum Drinking Age Act, enacted in 1984, is a federal law that established 21 as the minimum legal drinking age in the United States. This act aimed to reduce alcohol-related traffic accidents among young people by coercively incentivizing states to raise their drinking ages through the withholding of federal highway funds. The law illustrates how federal authority can influence state policies, highlighting the dynamics of command and coercive federalism in the governance of public health and safety.