Federalism explained — why the answer depends on your state

Article I, Section 8 lists what Congress may do: tax, borrow, regulate interstate and foreign commerce, coin money, establish post offices, grant patents, declare war, raise armies. The Tenth Amendment then states that powers not delegated to the United States are reserved to the states or the people.

In practice the Commerce Clause has done enormous work. Because almost any economic activity affects interstate commerce, Congress has used it to legislate on civil rights, environmental protection, workplace safety, drug policy and much else. The Supreme Court has expanded and narrowed this reading repeatedly over two centuries, and the boundary remains genuinely contested.

Where valid federal law and state law conflict, federal law wins under the Supremacy Clause. But most federal statutes do not occupy the field — they set a minimum and leave states free to go further.

That floor-and-ceiling structure is the key to reading almost any American rule. The federal minimum wage is $7.25 an hour and has not changed since 2009; more than half the states set a higher one, and none may set a lower one. Federal law prohibits employment discrimination on specified grounds; many states add sexual orientation, gender identity, marital status and more.

This is the list that matters when you actually live here. Every item below is a state matter, which is why national generalizations about them are usually wrong somewhere.

Note what does not change: your Social Security number, federal income tax, immigration status, Medicare, federal civil rights protections, credit reporting rules under the Fair Credit Reporting Act, and patents and copyright. These travel with you.

Several of the largest American programs are neither purely federal nor purely state, which is where most confusion concentrates.

Medicaid is jointly funded by federal and state governments but administered by states, which set eligibility within federal limits. That is why Medicaid coverage differs dramatically across state lines — the Affordable Care Act's expansion was made optional for states by the Supreme Court in 2012, and a minority of states have still not adopted it, producing a coverage gap for adults who earn too much for their state's Medicaid and too little for Marketplace subsidies.

Unemployment insurance is a federal-state partnership: federal law sets the framework, states set benefit levels and duration. Weekly maximums and how many weeks you can claim vary enormously.

The ACA Marketplace runs federally through HealthCare.gov in most states, but around twenty operate their own exchange with their own enrollment dates and rules.

Highway funding, education funding and disaster response all operate as federal money delivered through state administration, with conditions attached — the mechanism by which the federal government influences areas it cannot directly regulate.

There is no single directory, but there is a reliable sequence.

Start with the subject. Anything involving the IRS, Social Security, Medicare, immigration, passports or federal benefits is federal — one agency, one set of rules, same everywhere.

Anything involving a license, a lease, a vehicle, a marriage, a professional qualification, an insurance policy or a criminal charge is almost certainly state. The agency will be a state department of motor vehicles, insurance, labor, or the state attorney general.

Anything involving a property line, zoning, a building permit, trash collection, a school assignment or property tax is local — county or city.

Where a private company is involved, both may apply: a federal regulator such as the CFPB or FTC sets baseline rules, and your state attorney general enforces state consumer law on top. Complaining to both is normal and often effective.

USA.gov is the federal front door and will route most questions. For state questions, searching for the state name plus the agency function — 'Ohio department of insurance', 'Texas attorney general consumer complaint' — is faster than any national directory.

The thirteen original states were independent entities that had just fought a war against a distant central authority, and the first attempt at union — the Articles of Confederation — failed because the central government was too weak to function. The 1787 Constitution was a compromise between those who wanted a strong national government and those who feared recreating what they had escaped.

The compromises are visible in the structure. Equal Senate representation regardless of population protected small states. The Electoral College split the difference between congressional selection and popular vote. Enumerated federal powers with everything else reserved was the price of ratification, and the Bill of Rights was added in 1791 largely to secure it.

The boundary has moved substantially since. The Civil War and the Fourteenth Amendment applied federal constitutional protections against the states. The New Deal expanded federal economic regulation dramatically. The civil rights era used federal power to override state law directly. More recent decisions have narrowed federal authority in some areas and returned questions to the states.

This is not a settled arrangement, and it was never intended to be. Federalism in America is an ongoing argument with a written referee, and the line moves with each generation of Supreme Court decisions.