Today the feds are up to the same pressures on the territories. The Puerto Rican Government ifs feeling the threat of our financial threats to change their minimum drinking age as well. Guam has already raised it's minimum age to 21.
In a article in the Caribbean Business tells of the same financial pressures being put on Puerto Rico.
I'm not trying to disagree with the idea of 21 being the minimum age, but I do fee that sovereign nations and states do have some rights to make their own decisions with out "bullying" from Uncle Sam.