The Mandated Law of 21 was set By The Legislator of the US Govt. and was Given The States of USA Mandated that The 21 Age Would be set by Each State, or The Federal Money would not be given by the Feds!
I am not sure, but that at that moment of time was BlackMail. Do or Die!
It happened. It is today just as The National Speed Limit was put into place.
What I just Love is some Old Shits in Washington deciding what is best for the Multitude!
But, They are Our So Duly Elected Morons!