Question: Age 21 became the uniform legal drinking age across the us in?

context: No context provided
question: When did the law pass where 21 would become the uniform legal drinking age across the US?
short_answers: July 17, 1984
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question: Age 21 became the legal drinking age across the US, requiring states to officially have their drinking ages raised to 21 by when?
short_answers: October 1986

Answer: In the United States, a law was passed on July 17, 1984 making the uniform legal drinking age 21. Known as The National Minimum Drinking Age Act of 1984, it was passed by the United States Congress and was later signed into law by President Ronald Reagan. The states had to have their drinking ages raised to 21 by October 1986.