McCulloch v. Maryland (1819) is a required AP Gov Supreme Court case holding that Congress can create a national bank under the Necessary and Proper Clause and that Maryland cannot tax it, establishing implied powers and the supremacy of federal law over conflicting state law.
McCulloch v. Maryland (1819) answered two questions that the Constitution doesn't directly settle. First, can Congress charter a national bank even though "create a bank" appears nowhere in Article I? Chief Justice John Marshall said yes. The Necessary and Proper Clause (the Elastic Clause) gives Congress implied powers, meaning powers reasonably connected to its enumerated ones, like taxing, borrowing, and regulating commerce. Second, can Maryland tax that bank? No. "The power to tax involves the power to destroy," Marshall wrote, and under the Supremacy Clause, a state cannot use its powers to undermine a legitimate federal institution.
For AP Gov, McCulloch is the foundational pro-national-power case. It expanded what the federal government can do beyond the literal text of the Constitution and made clear that when federal and state authority collide, the federal government wins. Every later fight over the federal-state balance of power, from New Deal programs to United States v. Lopez, plays out on the field McCulloch built.
McCulloch lives in Unit 1: Foundations of American Democracy, Topic 1.9 (Federalism in Action) and supports learning objective AP Gov 1.9.A: explaining how the distribution of powers between national and state governments impacts policymaking. The essential knowledge here is that shared and concurrent powers create multiple access points for influencing policy, and that national policymaking is constrained by power-sharing with the states. McCulloch is the case that tilts that distribution toward Washington. By recognizing implied powers, it gave Congress room to legislate on things the Founders never listed, which is exactly why the federal government today can run programs from environmental regulation to grant-in-aid funding. It's also one of the required Supreme Court cases you must know cold, because the SCOTUS Comparison FRQ can pair it with a non-required case and ask you to apply its reasoning.
Implied Powers and the Elastic Clause (Unit 1)
McCulloch is where implied powers stop being a theory and become constitutional law. The Necessary and Proper Clause is the textual hook; McCulloch is the case that tells you how far that hook stretches. If an FRQ asks where implied powers come from, this case is your evidence.
Supremacy Clause (Unit 1)
The second half of McCulloch is a Supremacy Clause holding. Maryland's tax lost because state law cannot defeat valid federal law. The 2026 SCOTUS Comparison FRQ asked for the constitutional clause common to McCulloch and Bonito Boats v. Thunder Craft Boats, and the answer is the Supremacy Clause.
United States v. Lopez (Unit 1)
Lopez (1995) is McCulloch's mirror image. McCulloch expanded federal power; Lopez limited it by striking down the Gun-Free School Zones Act as beyond the Commerce Clause. The exam loves making you contrast these two, since together they show federalism is a tug-of-war, not a settled line.
Cooperative Federalism and Federal Grants (Unit 1)
McCulloch's broad reading of national power is what makes cooperative federalism possible. Categorical and block grants, and laws like the Clean Air Act, all depend on Congress acting beyond a narrow list of enumerated powers. That doctrinal space starts with Marshall's opinion in 1819.
McCulloch shows up two ways. In multiple choice, expect questions asking you to identify which case expanded federal power or to contrast it with a case affirming state authority in areas of concurrent power. A classic stem asks how McCulloch and United States v. Lopez differently affected federal and state policymaking (McCulloch expanded national policymaking room; Lopez carved some back for the states). On the FRQ side, McCulloch is a required case for the SCOTUS Comparison question. The 2026 exam paired it with Bonito Boats, Inc. v. Thunder Craft Boats, Inc. (1989) and asked for the constitutional clause common to both, which is the Supremacy Clause. To be ready, you need to know the facts (Maryland taxed the national bank), the two holdings (implied powers exist; states can't tax federal institutions), and the clauses involved (Necessary and Proper, Supremacy), then apply that reasoning to an unfamiliar case.
These are the two required federalism cases, and the exam deliberately pairs them because they pull in opposite directions. McCulloch (1819) expanded federal power through the Necessary and Proper Clause and Supremacy Clause. Lopez (1995) limited federal power by ruling that carrying a gun near a school isn't "commerce," so Congress couldn't regulate it under the Commerce Clause. Quick check for any question: does the holding give power to Washington (McCulloch) or hand some back to the states (Lopez)?
McCulloch v. Maryland (1819) held that Congress can create a national bank because the Necessary and Proper Clause gives the federal government implied powers beyond those listed in the Constitution.
The case also held that Maryland could not tax the national bank, because under the Supremacy Clause states cannot use their powers to undermine legitimate federal institutions.
McCulloch is one of the required Supreme Court cases for AP Gov and can appear on the SCOTUS Comparison FRQ paired with a non-required case, as it did in 2026 alongside Bonito Boats v. Thunder Craft Boats.
On the exam, McCulloch is the go-to evidence for federal power expanding, while United States v. Lopez is the go-to evidence for federal power being limited.
Under LO 1.9.A, McCulloch matters because it reshaped the distribution of powers between national and state governments, widening what national policymakers can do despite shared concurrent powers.
In 1819 the Supreme Court ruled that Congress had the constitutional authority to create a national bank under the Necessary and Proper Clause, and that Maryland could not tax that bank because federal law is supreme over state law.
Yes. It's one of the required Supreme Court cases in Unit 1 (Topic 1.9, Federalism in Action), and it can anchor the SCOTUS Comparison FRQ, where you compare its reasoning to a case you've never seen before.
The Necessary and Proper Clause (also called the Elastic Clause), which justified the bank through implied powers, and the Supremacy Clause, which blocked Maryland's tax. The 2026 FRQ specifically tested the Supremacy Clause connection.
They moved federalism in opposite directions. McCulloch (1819) expanded national power by recognizing implied powers, while Lopez (1995) limited national power by ruling the Commerce Clause couldn't justify a federal gun-free school zones law.
No. It said implied powers must still connect to enumerated powers in Article I, and later cases like United States v. Lopez show the Court will strike down federal laws that stretch too far. McCulloch widened the field; it didn't remove the boundaries.