Question

What case allowed congress to regulate the drinking age within the states using the tax and spending clause of article i?

Answer 1

South Dakota v. Dole

In 1984, Congress passed legislation requiring the Secretary of Transportation to withhold five percent of federal highway funds from states that did not adopt a 21-year-old minimum drinking age. South Dakota challenged the law. In a 7-to-2 decision, the Court held that Congress, acting indirectly to encourage uniformity in states' drinking ages, was within constitutional bounds.