Reserved powers are the constitutional authorities that states retain because the Constitution never granted them to the federal government. The 10th Amendment formally declares this principle: "The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people." This amendment acts as a check on federal power—if a power isn't enumerated in Article I, Section 8, it belongs to the states.
States control education policy, professional licensing, marriage and divorce law, most criminal law, local policing, business regulation within state borders, and public health decisions. States can set their own minimum wage, determine voting eligibility rules (within constitutional limits), regulate insurance, and control land use through zoning. These reserved powers enable federalism: states become "laboratories of democracy" where they can experiment with different policies. Massachusetts legalized same-sex marriage a decade before the Supreme Court required all states to do so. Colorado and Washington legalized recreational marijuana while federal law still bans it.
The boundary between federal and state power remains contested. The Supreme Court has generally expanded federal power under the Commerce Clause to regulate almost anything affecting interstate commerce, but more recent decisions have revived limits on federal authority. States sometimes push back, challenging federal regulations as exceeding enumerated powers. The tension between reserved powers and federal authority defines much of American constitutional law.
Reserved powers are why states can set different education standards, environmental rules, and criminal penalties. Understanding reserved powers explains why policy varies so dramatically between states on issues Congress hasn't fully regulated.
People often think the federal government can regulate anything. In practice, states retain broad reserved powers unless Congress specifically acts within its enumerated authorities, and courts sometimes strike down federal laws as exceeding those enumerated powers.
Reserved powers are why states can set different education standards, environmental rules, and criminal penalties. Understanding reserved powers explains why policy varies so dramatically between states on issues Congress hasn't fully regulated.
People often think the federal government can regulate anything. In practice, states retain broad reserved powers unless Congress specifically acts within its enumerated authorities, and courts sometimes strike down federal laws as exceeding those enumerated powers.