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🍔American Society

Major US Constitutional Amendments

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Why This Matters

The Constitution isn't just a historical document—it's the framework that defines the relationship between individuals and government power. When you're tested on constitutional amendments, you're really being asked to demonstrate your understanding of civil liberties vs. civil rights, federalism, the incorporation doctrine, and how social movements translate into legal change. These amendments show up constantly in questions about Supreme Court cases, the expansion of democracy, and ongoing policy debates.

Don't just memorize which amendment does what. Know why each amendment exists, what problem it solved, and how it connects to broader patterns in American political development. The exam rewards students who can explain the difference between protections from government (civil liberties) and protections by government (civil rights), and who can trace how constitutional change reflects shifting social values.


Protections from Government Power (Civil Liberties)

These amendments establish what the government cannot do to individuals. They create a zone of personal freedom where state power must stop—the foundation of limited government.

First Amendment

  • Five freedoms in one amendment—speech, religion, press, assembly, and petition form the core of expressive liberty
  • Establishment and Free Exercise clauses create the separation of church and state while protecting religious practice
  • Foundation for democratic participation—without free expression and assembly, citizens cannot hold government accountable

Second Amendment

  • "Well-regulated militia" clause creates ongoing interpretive debate about individual vs. collective rights
  • District of Columbia v. Heller (2008) established an individual right to bear arms unconnected to militia service
  • Incorporation through McDonald v. Chicago (2010) applied this right against state governments via the Fourteenth Amendment

Fourth Amendment

  • Probable cause and warrant requirements protect against arbitrary government searches
  • Exclusionary rule (established in Mapp v. Ohio) makes illegally obtained evidence inadmissible in court
  • Privacy expectations extend to digital communications—a growing area of constitutional debate

Fifth Amendment

  • Due process clause guarantees fair legal procedures before government can deprive you of life, liberty, or property
  • Self-incrimination protection ("pleading the Fifth") prevents forced confessions and coerced testimony
  • Double jeopardy prohibition means the government gets one chance to convict—preventing harassment through repeated prosecution

Compare: Fourth Amendment vs. Fifth Amendment—both limit government power in criminal proceedings, but the Fourth restricts how evidence is gathered while the Fifth restricts how defendants are treated. FRQs often ask you to identify which amendment applies to a specific scenario.


The Reconstruction Amendments (Civil Rights Foundation)

The Thirteenth, Fourteenth, and Fifteenth Amendments transformed the Constitution after the Civil War. Together, they shifted power toward the federal government and created the legal basis for civil rights—protections the government must actively provide.

Thirteenth Amendment

  • Abolished slavery and involuntary servitude throughout the United States (1865)
  • Only amendment that restricts private action—it doesn't just limit government but bans slavery by anyone
  • "Except as punishment for crime" clause remains controversial, connecting to debates about prison labor

Fourteenth Amendment

  • Citizenship clause overturned Dred Scott by granting citizenship to all persons born or naturalized in the U.S.
  • Equal Protection clause requires states to treat people equally under law—the basis for most civil rights litigation
  • Due Process clause (state level) enables incorporation—applying Bill of Rights protections against state governments

Fifteenth Amendment

  • Prohibited voting discrimination based on race, color, or previous condition of servitude (1870)
  • Enforcement proved difficult—states used poll taxes, literacy tests, and grandfather clauses to circumvent it
  • Required Voting Rights Act of 1965 to become fully effective nearly a century later

Compare: Thirteenth vs. Fourteenth Amendment—the Thirteenth ended a specific practice (slavery), while the Fourteenth established ongoing protections (equal protection, due process). The Fourteenth is far more frequently litigated because of its broader application.


Expansion of Democratic Participation

These amendments progressively broadened who counts as "We the People" by extending voting rights to previously excluded groups—demonstrating how the Constitution evolves through formal amendment.

Nineteenth Amendment

  • Women's suffrage achieved in 1920 after decades of activism by the suffragist movement
  • Doubled the eligible electorate overnight, representing the largest single expansion of voting rights
  • Built on state-level victories—western states had already granted women voting rights before national ratification

Twenty-Sixth Amendment

  • Lowered voting age from 21 to 18 in response to Vietnam War-era protests (1971)
  • "Old enough to fight, old enough to vote" argument connected military service to democratic participation
  • Fastest ratification in history—completed in just 100 days, reflecting broad consensus

Compare: Fifteenth vs. Nineteenth vs. Twenty-Sixth Amendments—all expanded suffrage, but to different groups (race, gender, age). Notice the pattern: each required sustained social movement pressure before formal constitutional change occurred. This sequence illustrates how the Constitution becomes more democratic over time.


Structural and Procedural Protections

Some amendments don't expand rights but establish rules for how government operates—ensuring accountability and preventing self-dealing.

Twenty-Seventh Amendment

  • Delays congressional pay raises until after the next election, so voters can respond
  • Originally proposed in 1789 but not ratified until 1992—the longest ratification period in history
  • Revived by a college student's research project, demonstrating that "dead" amendments can be resurrected

Quick Reference Table

ConceptBest Examples
Civil Liberties (limits on government)First, Second, Fourth, Fifth Amendments
Civil Rights (government protections)Thirteenth, Fourteenth, Fifteenth Amendments
Incorporation DoctrineFourteenth Amendment Due Process Clause
Voting Rights ExpansionFifteenth, Nineteenth, Twenty-Sixth Amendments
Criminal Procedure ProtectionsFourth, Fifth Amendments
Post-Civil War ReconstructionThirteenth, Fourteenth, Fifteenth Amendments
Structural/Procedural RulesTwenty-Seventh Amendment

Self-Check Questions

  1. Which two amendments both protect individuals during criminal proceedings, and what specific protection does each provide?

  2. How does the Fourteenth Amendment's Due Process Clause enable the Bill of Rights to apply to state governments? What is this process called?

  3. Compare and contrast the Thirteenth and Fourteenth Amendments: which one restricts private action, and which one has been used more frequently in court cases? Why?

  4. If an FRQ asks about the expansion of democracy in America, which three amendments would you cite, and what pattern do they demonstrate about constitutional change?

  5. A student claims the First Amendment protects them from being fired by a private employer for their political speech. Using your understanding of civil liberties, explain why this claim is incorrect.