Every modern Second Amendment research path still begins with two cases: District of Columbia v. Heller, 554 U.S. 570 (2008) and McDonald v. City of Chicago, 561 U.S. 742 (2010). Heller held that the Second Amendment protects an individual right to keep and bear arms for self-defense, unconnected to militia service. McDonald held that this right is fully applicable to the States through the Fourteenth Amendment. Later decisions—especially New York State Rifle & Pistol Ass’n v. Bruen, 597 U.S. 1 (2022) and United States v. Rahimi, 602 U.S. 680 (2024)—change methodology and applications, but they do not displace Heller and McDonald as the right’s foundations.
Background: collective right versus individual right
Before Heller, lower courts often treated the Second Amendment as protecting only a collective or militia-linked interest, leaving little room for individual challenges to handgun bans. The District of Columbia’s prohibition on handgun possession and its functional ban on operable firearms in the home presented a clean vehicle. Heller rejected the collective-right view and located the Amendment’s core in lawful self-defense, with the handgun as the quintessential self-defense weapon for Americans.
McDonald followed against Chicago’s handgun ban. The Court incorporated the Second Amendment right through the Fourteenth Amendment, making Heller’s core protections binding on state and local governments. Together, the cases constitutionalized a national baseline: governments may regulate, but they may not extinguish the core individual right to keep ordinary arms for self-defense in the home.
What the Court held
Heller’s central holding remains the doctrinal north star:
The Second Amendment protects an individual right to possess a firearm unconnected with service in a militia, and to use that arm for traditionally lawful purposes, such as self-defense within the home.
Heller also offered illustrative limits that still structure briefing:
Nothing in our opinion should be taken to cast doubt on longstanding prohibitions on the possession of firearms by felons and the mentally ill, or laws forbidding the carrying of firearms in sensitive places such as schools and government buildings, or laws imposing conditions and qualifications on the commercial sale of arms.
McDonald then nationalized the right:
The Second Amendment right recognized in Heller is fully applicable to the States through the Fourteenth Amendment; state and local governments are bound by the same core individual right to keep and bear arms for self-defense.
Bruen built on that foundation by protecting public carry and requiring historical tradition analysis rather than means-end scrutiny. Rahimi confirmed that historically grounded disarmament of dangerous individuals can coexist with the individual right. Ultra-recent cases such as United States v. Hemani (2026) and Wolford v. Lopez (2026) continue to apply those foundations to drug-user bans and place-based carry rules; cite them in plain text when needed and link Heller, McDonald, Bruen, and Rahimi for controlling doctrine.
Why it matters
Without Heller, there is no judicially enforceable individual Second Amendment right as we know it. Without McDonald, Heller would constrain only the federal government. Every state assault-weapon case, magazine-limit challenge, licensing regime, and § 922(g) prosecution still cites both. Bruen changed how courts test regulations; it did not rewrite Heller’s individual-right holding or McDonald’s incorporation.
Comparative citations sometimes include First Amendment cases—Reed v. Town of Gilbert, 576 U.S. 155 (2015) for discussions of categorical rules, or Citizens United v. FEC, 558 U.S. 310 (2010) for speaker-based distinctions in a different amendment—but those are analogies. Second Amendment research memos should lead with Heller and McDonald, then layer Bruen’s method and Rahimi’s status-ban application.
Practical takeaways
- Cite Heller for the individual right, handguns, home self-defense, and the list of presumptively lawful regulatory examples.
- Cite McDonald whenever the defendant is a state or local government or the challenge arises under state law.
- Cite Bruen for public carry and the text-and-history test; cite Rahimi for dangerous-person disarmament after Bruen.
- Treat Hemani (2026) and Wolford (2026) as plain-text applications unless and until stable corpus links exist.
- Do not read Heller’s “presumptively lawful” examples as exempt from Bruen’s historical showing—use them as starting points for analogy.
- Keep core versus periphery clear: bans on common arms for lawful self-defense remain the paradigm invalid law under Heller.
Frequently asked questions
What did District of Columbia v. Heller hold?
Heller held that the Second Amendment protects an individual right to keep and bear arms for traditionally lawful purposes such as self-defense in the home, and it invalidated D.C.’s handgun ban and related operable-firearm requirements as applied to that core.
What did McDonald v. City of Chicago add?
McDonald incorporated the Second Amendment right recognized in Heller against the States through the Fourteenth Amendment, so state and local gun laws must comply with that individual right.
Are Heller and McDonald still controlling after Bruen?
Yes. Bruen builds on Heller and McDonald by extending public-carry protection and replacing means-end scrutiny with a text-and-history test; it does not overrule the individual-right or incorporation holdings.