Final answer:
Driving with a BAC of 0.08% or higher is against the law in all 50 states, influenced by laws such as the National Minimum Drinking Age Act of 1984 and efforts by organizations like MADD to combat impaired driving.
Step-by-step explanation:
The establishment of the BAC limit is also related to the historical context of alcohol regulation in the United States, including the Eighteenth Amendment and the Volstead Act that led to Prohibition, and later developments such as the Twenty-First Amendment that gave states the power to regulate alcohol.