Age 21 became the uniform legal drinking age across the u. s. in:

The drinking age in the US became 21 as of 1984. This became law after the National Minimum Drinking Age Act was passed by Congress. The origins of this law can be credited to several different organizations that studied the effect of drinking and driving accidents/fatalities. This group of organizations included popular ones like MADD (Mothers Against Drunk Driving). This campaign to raise the drinking age worked and is still the law today.