Surveys show that 80% of the public supports setting the drinking age at 21 and there is little or no variation by state in these public attitudes. Despite the strong public support for the minimum legal drinking age 21 (MLDA-21), it is likely that if Congress had not adopted 21 as the national drinking age, the MLDAs would still vary considerably from state to state. If the federal law is repealed, there will again be wide variability in the drinking age in each state. Highways cross state borders and most are built with federal funds and so it is very much the federal government’s business to ensure that we do not return to the “blood borders” for young people that were created by different drinking ages in different states back in the 1970s.