Lower the Federal drinking age from 21 to 18

As you all know the US legal drinking age is 21 in all states but the age at which you become an adult is 18. It makes no sense that a person considered an adult is not legally allowed to have a drink but is legally allowed to vote, join the army and die fighting for his/her country or move out from parents house and even marry someone. I think that if your old enough to do these things then you should also be considered old enough to make your own decision if your going to have a drink or not.
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