Final answer:
A contact agreement to sell alcohol to a minor is illegal and unenforceable, as it violates the National Minimum Drinking Age Act of 1984 and generally accepted legal principles.
Step-by-step explanation:
A contact agreement to sell alcohol to a minor is considered illegal and unenforceable. In the United States, the sale, transportation, and importation of intoxicating liquors to minors violates the National Minimum Drinking Age Act of 1984, which mandates that states set the minimum legal drinking age to twenty-one or face federal highway funding penalties. Furthermore, a contract that involves an illegal act, such as selling alcohol to minors, is void and cannot be upheld in court.