Tenth Amendment: This term refers to an amendment in the Bill of Rights that states powers not delegated to the federal government nor prohibited to the states are reserved for the states or the people.
National Federation of Independent Business v Sebelius: In this case, decided in 2012, the Supreme Court upheld most provisions of the Affordable Care Act but also limited Congress's power under the Commerce Clause by ruling that individuals cannot be compelled to purchase health insurance.
New York v United States: In this case from 1992, the Supreme Court ruled that certain provisions of a federal law requiring states to take title to low-level radioactive waste violated state sovereignty as protected by the Tenth Amendment.