Alcohol purchase age in the US is actually a state law, not national. It just happens that all 50 states have their law set at 21.
Not exactly a coincidence - the feds blackmailed them into it. Threatened to withhold highway repair funds if the states didn't set the age to 21. Just a minor rape of the 10th amendment.
Not exactly a coincidence - the feds blackmailed them into it. Threatened to withhold highway repair funds if the states didn't set the age to 21. Just a minor rape of the 10th amendment.