Understanding State vs. Federal Power

Federalism is the constitutional principle that distributes governing authority between the national (federal) government and the individual state governments. Rather than concentrating all power in one place, the framers of the Constitution designed a system where both levels of government operate independently within their own spheres while also sharing certain responsibilities.

The foundation of this system is the U.S. Constitution. Article I grants specific powers to Congress. Article II defines the executive branch. And critically, the Tenth Amendment states: "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 is the cornerstone of state sovereignty within the federal system.

In practice, federalism means that the federal government and state governments each have their own constitutions, legislatures, executives, and court systems. You live under the authority of both simultaneously, and which level of government has the final say depends on the issue at hand.

Read the Tenth Amendment at constitution.congress.gov

The Constitution grants certain enumerated powers exclusively to the federal government. These are areas where only Congress and the federal executive can act, and states cannot legislate independently.

Key federal powers outlined in Article I, Section 8 of the Constitution include:

• Declaring war and maintaining armed forces -- Only Congress can declare war, and the federal government commands the military.
• Regulating interstate and foreign commerce -- The Commerce Clause gives Congress authority over trade that crosses state lines or national borders.
• Coining money and regulating its value -- States cannot print their own currency.
• Establishing immigration and naturalization rules -- Federal law governs who may enter the country and become a citizen.
• Making treaties with foreign nations -- Only the President, with Senate approval, can enter into treaties.
• Establishing post offices -- The postal system is a federal function.

Beyond these enumerated powers, the Necessary and Proper Clause (also in Article I, Section 8) grants Congress the authority to make laws needed to carry out its enumerated powers. This clause, sometimes called the "elastic clause," has been the basis for significant expansions of federal authority over time.

Under the Tenth Amendment, any power not specifically granted to the federal government and not prohibited to the states remains with the states or the people. These reserved powers are broad and cover many of the government functions that most directly affect daily life.

Areas where states hold primary authority include:

• Education -- States establish and fund public school systems, set curriculum standards, and govern higher education institutions. There is no federal right to education in the Constitution.
• Law enforcement and criminal law -- Most criminal law is state law. State and local police handle the vast majority of law enforcement. Each state defines its own criminal code, penalties, and court procedures.
• Elections administration -- While the Constitution sets some baseline requirements, states run their own elections, including setting voter registration rules, designing ballots, and managing polling places.
• Family law -- Marriage, divorce, child custody, and adoption are governed by state law.
• Land use and zoning -- States and their local governments control how land can be used, including housing, commercial development, and environmental protections at the local level.
• Licensing and regulation -- Professional licenses for doctors, lawyers, teachers, and other occupations are issued by states, each with its own requirements.

States also have concurrent powers -- authorities shared with the federal government. Both levels of government can levy taxes, build roads, establish courts, and borrow money. When both act in the same area, questions of conflict and preemption arise.

Because state and federal governments sometimes legislate in the same areas, conflicts can arise. The Constitution provides a clear rule for resolving these conflicts: the Supremacy Clause in Article VI establishes that the Constitution and federal laws made under it are the "supreme Law of the Land." When a valid federal law directly conflicts with a state law, the federal law prevails.

This principle is known as preemption. There are several ways preemption works:

• Express preemption -- Congress explicitly states in the text of a law that it overrides state law on that subject.
• Implied preemption -- Even without explicit language, federal law may preempt state law if Congress has so thoroughly regulated an area that it is clear the federal government intended to occupy the entire field (known as "field preemption").
• Conflict preemption -- A state law is preempted if it is impossible to comply with both the state and federal law simultaneously, or if the state law stands as an obstacle to the objectives of the federal law.

However, preemption is not always straightforward. States can sometimes set stricter standards than federal law. For example, states may enact environmental regulations that exceed federal minimums, as long as they do not directly contradict federal requirements. Whether a state law is preempted often depends on how the federal law is written and how courts interpret it.

Disputes over preemption are frequently settled by the federal courts, including the Supreme Court, which has the final say on questions of constitutional interpretation.

Understanding the division of power between state and federal government is practical, not just theoretical. It determines who to contact when you want to change a policy and which elections matter most for the issues you care about.

If you want to change how schools operate in your community, your state legislature and local school board are the places to start -- not Congress. If you are concerned about immigration policy, that is a federal issue. If you care about criminal justice reform, most criminal law is state law, so your state legislators and governor have the most direct authority.

This also means that state and local elections have an enormous impact on your daily life. Governors, state legislators, attorneys general, and local officials make decisions about education funding, policing, infrastructure, business regulations, and much more. Voter turnout in state and local elections is typically much lower than in presidential elections, which means your vote and your voice carry even more weight.

When you are advocating for a policy change, the first step is always to ask: which level of government has authority over this issue? Directing your energy to the right officials makes your advocacy more effective. Use our contact tool to find both your federal and state officials.