What are enumerated powers?

Enumerated powers are the specific authorities the Constitution lists for the federal government, particularly the powers given to Congress in Article I, Section 8. The Founders chose enumeration deliberately. They had just rejected the broad authority of the British Parliament and feared that an unenumerated national legislature could swallow state sovereignty. By naming each federal power, they signaled that anything not listed was either reserved to the states or denied to government altogether.

Article I, Section 8 lists eighteen clauses of congressional power. Congress may lay and collect taxes, duties, imposts, and excises to pay debts, provide for the common defense, and promote the general welfare. It may borrow money on the credit of the United States. It may regulate commerce with foreign nations, among the several states, and with Native American tribes. It may establish uniform rules of naturalization and bankruptcy laws, coin money, fix the standard of weights and measures, punish counterfeiting, establish post offices and post roads, and grant patents and copyrights. Congress may constitute tribunals inferior to the Supreme Court, define and punish piracy and offenses against the law of nations, declare war, raise and support armies for terms not exceeding two years, provide and maintain a navy, make rules for the government and regulation of the land and naval forces, call forth the militia, and exercise exclusive legislation over the District of Columbia and federal installations.

The list closes with the Necessary and Proper Clause, which permits Congress to make all laws needed to execute these powers. Other articles add powers, like the impeachment power, the power to admit new states, and treaty advice and consent. The Tenth Amendment, ratified in 1791, completes the design by reserving any powers not delegated to the federal government and not prohibited to the states to the states or the people.

Modern Supreme Court decisions like United States v. Lopez in 1995 and United States v. Morrison in 2000 have reinforced that enumerated powers have outer limits, striking down federal laws that exceeded the Commerce Clause. Other rulings, like Wickard v. Filburn in 1942 and Gonzales v. Raich in 2005, have read the powers broadly. The boundary between enumerated and unenumerated remains one of the most contested topics in constitutional law.