Seems like the threat of having federal highway funds withheld from a State would be sufficient in lieu of a constitutional amendment to force every State to kowtow to federal mandates - as was the case with the 55MPH national speed limit under NMSL, and the forced prohibition of alcohol sales to anyone under 21 years of age.

The previous drinking age limit in this state was 18. At age 18 one can vote and serve in the Country's armed forces but not enjoy a watered down Budweiser.:+

Jim,