The National Minimum Drinking Age Act pressed states to raise the legal age for alcohol purchase to what age?

1. Mothers Against Drunk Driving turned to Congress after its lobbying of state legislators stalled. 2. The 1984 federal law gradually cut highway grant money to any state that failed to raise the alcohol purchase and possession age to twenty-one. 3. Every state complied by 1988 rather than lose the road money. _Source: OpenStax American Government 3e (CC BY 4.0), Ch 3 "American Federalism", section 3.4 Competitive Federalism Today_