4.1 Federalism: Dividing Power Between Nation and States
Key Takeaways
- Federalism (CG.b.9) divides sovereign power between one national government and 50 state governments — neither is a subordinate branch of the other within its own sphere.
- Article VI's Supremacy Clause makes valid federal law supreme over conflicting state law; the 10th Amendment reserves all powers not delegated to the federal government to the states or the people.
- McCulloch v. Maryland (1819) confirmed Congress has implied powers under the Necessary and Proper Clause and that states cannot tax federal institutions; Gibbons v. Ogden (1824) gave Congress broad authority over interstate commerce.
- Powers split into three categories: delegated/enumerated (federal-only, e.g., coining money, declaring war), reserved (state-only, e.g., education, marriage law), and concurrent (shared, e.g., taxation, courts, borrowing money).
- Federalism is not a settled 1787 relic — it is actively contested today in disputes over marijuana legalization, immigration enforcement, and federal grant conditions, and GED items often frame Contemporary Public Policy (CG.f) through this lens.
Why Federalism Matters on the GED
Federalism is one of the eight named principles under Civics and Government content topic CG.b ("Principles that have contributed to development of American constitutional democracy"), and it is the principle test-takers meet most often outside the classroom — every debate over state marijuana laws, sanctuary cities, or a governor defying a federal mandate is a federalism debate. Because Civics and Government carries 50% of the GED Social Studies test — more than the other three content areas combined — mastering this single concept has an outsized payoff. Federalism items typically present a scenario (a law, a court case, a policy dispute) and ask the test-taker to identify which level of government has authority, or to classify a power as federal, state, or shared.
Defining Federalism
Federalism is a system of government in which power is constitutionally divided between a national (federal) government and regional (state) governments, with each level holding final authority over certain matters rather than one level simply delegating tasks to the other. This sets the United States apart from two alternative structures the GED expects you to distinguish:
- Unitary system — all governing power is held by the central government, which may create or abolish local governments at will (e.g., France, the United Kingdom, Japan). Local units have no independent constitutional standing.
- Confederation — independent states or territories retain nearly all power and voluntarily delegate a limited, revocable set of functions to a weak central authority. The United States tried this model first, under the Articles of Confederation (1781–1789), and it failed: the central government could not levy taxes, regulate interstate commerce, or field an army to put down unrest like Shays' Rebellion (1786–87), a major reason the Framers scrapped it for the Constitution.
Federalism is the compromise between these two failure modes: strong enough at the center to act as one nation, but with sovereign states retaining real, protected authority.
The Constitutional Basis
Two provisions do almost all of the legal work for federalism, and GED items frequently quote or paraphrase them directly:
| Provision | Location | What It Does |
|---|---|---|
| Supremacy Clause | Article VI, Clause 2 | Makes the Constitution, federal laws made in pursuance of it, and treaties "the supreme Law of the Land" — binding on state judges even if a state constitution or law conflicts, as long as the federal government is acting within its constitutional powers |
| 10th Amendment | Bill of Rights (1791) | "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" — the textual source of reserved powers |
Notice the Supremacy Clause is conditional: it only defeats state law when the federal government has actually been given that power by the Constitution. A federal law that exceeds Congress's enumerated powers does not automatically win under the Supremacy Clause — this is exactly why the scope of federal power has been fought over in court for two centuries.
Three Categories of Power
| Category | Held By | Examples |
|---|---|---|
| Delegated (enumerated) powers | Federal government only | Coining money, declaring war, regulating interstate and foreign commerce, conducting foreign policy and treaties, establishing post offices, naturalizing citizens |
| Reserved powers | State governments only | Public education, marriage and family law, intrastate commerce, general police powers (health, safety, morals), administering elections, licensing (drivers, professions) |
| Concurrent powers | Both federal and state governments | Levying taxes, building roads, establishing courts, borrowing money, chartering banks |
A quick mapping trick: if the Constitution names it, it is almost certainly delegated; if it is a traditional local function the Constitution never mentions, it is reserved; if both Washington and your state capital plainly do it (tax you, build a courthouse), it is concurrent. (Chapter 6 covers the full federal-vs-state powers list and the amendment process in structural detail — this section is about why the division exists and how courts have drawn its lines.)
Landmark Cases That Defined the Line
Two early Supreme Court cases, both decided under Chief Justice John Marshall, permanently shaped how broadly federal power is read, and both appear regularly as GED stimulus passages:
- McCulloch v. Maryland (1819) — Maryland tried to tax a branch of the federally chartered Bank of the United States. The Court ruled (1) Congress has implied powers under the Necessary and Proper Clause (Article I, Section 8) to create institutions like a national bank even though "bank" appears nowhere in the Constitution, and (2) a state cannot tax a legitimate federal institution, because, in Marshall's famous phrase, "the power to tax involves the power to destroy." This case is the foundation of the implied powers doctrine.
- Gibbons v. Ogden (1824) — New York had granted a private company a monopoly over steamboat navigation between New York and New Jersey. The Court struck it down, ruling that the Commerce Clause gives Congress broad authority to regulate any commercial activity that crosses state lines, including navigation — a precedent still cited today to justify federal regulation of interstate trucking, aviation, and even some environmental rules.
Federalism Today
The GED's Contemporary Public Policy focus (CG.f) often tests federalism through modern fiscal federalism tools and live disputes:
- Categorical grants — federal money given to states for a specific purpose with detailed conditions attached (e.g., the federal government tied a share of highway funding to states raising the drinking age to 21, upheld in South Dakota v. Dole, 1987).
- Block grants — federal money given for a broad purpose (e.g., community development) with far more state discretion over how to spend it.
- Unfunded mandates — federal requirements imposed on states without money to pay for them, a recurring source of state complaint.
- Live federal-state conflicts — state legalization of marijuana clashing with its federal Schedule I status under the Controlled Substances Act; "sanctuary" jurisdictions limiting local cooperation with federal immigration enforcement. Neither example has one "correct" political answer for the GED — the test only asks you to correctly identify which level of government is acting and which constitutional principle (Supremacy Clause, reserved powers, police powers) is in tension.
Common Trap
Test-takers frequently mislabel a concurrent power as reserved, or vice versa. If an answer choice describes taxation, court systems, or borrowing as belonging to "only the states" or "only the federal government," it is wrong — both levels do all three. Reserved powers are specifically the traditional local functions (education, marriage, intrastate commerce, policing) the Constitution never assigns to Congress at all.
A state legislature passes a law legalizing a substance that remains illegal under federal law. Which constitutional principle explains why federal law can still be enforced against that substance despite the state's action?
Which of the following is the BEST example of a concurrent power under the U.S. federal system?
Takeaways
- Federalism divides sovereign power between the national government and the states; neither is subordinate to the other within its own sphere.
- The Supremacy Clause (Article VI) and the 10th Amendment are the two constitutional anchors of federalism, and they work as a pair: one grants federal supremacy within its powers, the other reserves everything else to the states.
- McCulloch v. Maryland established implied powers and blocked state taxation of federal institutions; Gibbons v. Ogden established a broad reading of the Commerce Clause.
- Know the three power categories cold — delegated, reserved, concurrent — and be ready to classify a scenario, not just recite the definition.
- Federalism disputes are current events, not just 1787 history — expect a Contemporary Public Policy item to test the same principle through a 2020s-era conflict.