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Session Length
~17 min
Adaptive Checks
15 questions
Transfer Probes
8
Constitutional law is the body of law that defines the structure, powers, and limits of government, as well as the fundamental rights and freedoms of individuals. Rooted in a nation's constitution, whether written or unwritten, constitutional law serves as the supreme legal authority from which all other laws derive their legitimacy. In the United States, constitutional law centers on the interpretation and application of the U.S. Constitution, a document drafted in 1787 that established a federal system of government with separated powers among the legislative, executive, and judicial branches.
The study of constitutional law is inseparable from the role of judicial review, the power of courts to evaluate whether legislative and executive actions conform to the Constitution. Established in the landmark case Marbury v. Madison (1803), judicial review empowers the Supreme Court and lower federal courts to strike down laws and government actions that violate constitutional principles. Over more than two centuries, the Supreme Court has shaped American society through its interpretations of constitutional provisions, from the Commerce Clause and the Necessary and Proper Clause to the Bill of Rights and the Fourteenth Amendment's guarantees of due process and equal protection.
Constitutional law remains a dynamic and contested field. Debates over originalism versus living constitutionalism, the scope of individual rights, the balance between federal and state power, and the boundaries of executive authority continue to shape legal scholarship and public discourse. Understanding constitutional law is essential not only for lawyers and judges but for any citizen seeking to comprehend the legal framework that governs democratic society, protects civil liberties, and constrains governmental power.
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The power of courts to examine legislative and executive acts and determine whether they conform to the constitution. If an act is found unconstitutional, it is declared void and unenforceable.
Example: In Marbury v. Madison (1803), the Supreme Court established its power of judicial review by declaring a provision of the Judiciary Act of 1789 unconstitutional.
The constitutional principle that divides government authority among three branches: the legislative (Congress), the executive (the President), and the judicial (the courts), each with distinct functions and the ability to check the others.
Example: Congress passes legislation, but the President can veto it, and the Supreme Court can declare it unconstitutional, ensuring no single branch dominates.
The division of governmental power between a central (federal) government and regional (state) governments, each sovereign within its own sphere. The Tenth Amendment reserves powers not delegated to the federal government to the states or the people.
Example: States regulate their own criminal codes and education systems, while the federal government manages immigration, interstate commerce, and national defense.
The constitutional guarantee found in the Fifth and Fourteenth Amendments that no person shall be deprived of life, liberty, or property without fair legal proceedings. It encompasses both procedural due process (fair procedures) and substantive due process (protection of fundamental rights).
Example: A state cannot revoke a professional license without providing notice and an opportunity to be heard, as this would violate procedural due process.
The Fourteenth Amendment principle requiring that states treat all individuals in similar circumstances equally under the law. Courts apply varying levels of scrutiny depending on the classification at issue: strict scrutiny for race and national origin, intermediate scrutiny for gender, and rational basis review for most other classifications.
Example: In Brown v. Board of Education (1954), the Supreme Court held that racial segregation in public schools violated the Equal Protection Clause.
The First Amendment protection against government restrictions on expression, encompassing spoken and written words, symbolic speech, and certain forms of conduct. The protection is broad but not absolute, with recognized exceptions for incitement, true threats, obscenity, and certain other categories.
Example: In Tinker v. Des Moines (1969), the Court held that students wearing black armbands to protest the Vietnam War was protected symbolic speech under the First Amendment.
Article I, Section 8 of the Constitution grants Congress the power to regulate commerce among the states. Interpreted broadly since the New Deal era, it serves as the basis for much federal regulatory legislation.
Example: The Commerce Clause was used to uphold the Civil Rights Act of 1964, prohibiting racial discrimination in places of public accommodation that affect interstate commerce.
The legal doctrine through which most provisions of the Bill of Rights have been applied to state governments through the Due Process Clause of the Fourteenth Amendment, a process known as selective incorporation.
Example: In McDonald v. City of Chicago (2010), the Supreme Court incorporated the Second Amendment right to bear arms against state and local governments.
More terms are available in the glossary.
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