American adults between the ages of 18-20 can marry, adopt children, serve on juries, enter into binding legal contracts, operate businesses, employ others, go to prison, be executed, obtain abortions, engage in legal games of chance(Gamble), hunt with a deadly weapon, fly airplanes, drive automobiles and other vehicles, purchase pornography, vote, and risk their lives serving in the United States Military.
However, they cannot legally purchase or enjoy a alcohol beverage.