The Supreme Court Explained: How America’s Highest Court Works

Every year, over 7,000 individuals and groups petition the U.S. Supreme Court. The Court accepts only about 70 to 80—less than 1%. Yet that tiny fraction becomes the absolute law of the land. For anyone trying to understand American civic education, learning how the supreme court works is essential to seeing how these decisions shape our daily lives.

But how does this institution work? Who decides which cases get heard? And what happens when the nine justices make a historic misstep? This guide breaks down the mechanics, history, and critical checks of America’s highest court.

The Supreme Court in a Nutshell

• Highest court in the U.S.
• Head of the Judicial Branch (not elected).
• Final interpreter of federal law and the Constitution.

Why This Matters

Supreme Court cases often begin with ordinary people facing everyday problems. An 8-year-old girl challenged school segregation in Brown v. Board of Education. A 13-year-old student wore a black armband to protest the Vietnam War in Tinker v. Des Moines. A teenager posted a frustrated message on social media in Mahanoy Area School District v. B.L. What began as local disputes eventually became landmark Supreme Court cases that affected millions of Americans.

The Supreme Court affects many parts of daily life, from free speech and religious liberty to gun laws, healthcare, elections, and criminal justice. Although the Court hears only a small number of cases each year, its decisions can shape the rights, responsibilities, and opportunities of every American.

1. The Structure: Nine Seats, Lifetime Tenure

Designed to be insulated from political storms, the Supreme Court stands at the apex of the judiciary. Its nine members serve for life, ensuring they rule on the Constitution rather than public opinion.

The Size of the Court

There are currently nine Justices: one Chief Justice and eight Associate Justices.

• The Myth: Many Americans believe the Constitution fixes this number at nine.
• The Reality: The Constitution leaves the size of the Court entirely to Congress. The number fluctuated from five to ten throughout the 19th century before settling at nine in 1869.

Lifetime Appointments

Justices serve for life, holding their offices “during good behavior.”

• The Purpose: The Framers wanted an independent judiciary. If justices feared losing their jobs over unpopular rulings, they might cater to political whims rather than the Constitution.
• The Impact: A single appointment can alter the trajectory of American law for generations.

The Selection Process

Because justices are not elected, their confirmation is intensely political:

1. Nomination: When a vacancy occurs, the President selects a nominee.
2. Confirmation: The Senate Judiciary Committee vets the candidate, followed by a full Senate debate. A simple majority (51 votes) is required for confirmation.
3. Appointment: Once confirmed, the justice takes a lifetime seat on the bench.

2. The Process: How the Supreme Court Works From 7,000 Petitions to 70 Rulings

The Court acts as a national filter, accepting only the most significant cases.

[7,000+ Petitions Filed Annually]
           \               /
            \             /
             [Rule of Four: 4 Justices must agree]
               \       /
                \     /
          [70-80 Cases Heard]    

How Cases Are Selected

• Certiorari: Parties formally request review.
• Criteria: Justices look for “circuit splits” (lower courts disagreeing) or major constitutional questions.

Inside the Courtroom

Once accepted, cases move fast:

• Briefs: Lawyers submit written arguments. Interested groups may add amicus curiae (“friend of the court”) briefs.
• Oral Arguments: Lawyers face intense, 30-minute questioning, a rapid-fire test of logic, not a speech.
• Vote & Opinion: Justices confer in secret. The final ruling includes a Majority Opinion (law), Concurring Opinions (agreeing but for different reasons), and Dissenting Opinions (disagreement).

3. The Power: Judicial Review in Action

The Supreme Court’s most formidable power is Judicial Review: the authority to declare laws passed by Congress, or actions taken by the President, unconstitutional.

Interestingly, the Court holds neither operational force nor financial control. As Alexander Hamilton famously observed in Federalist No. 78, the judiciary has “no influence over either the sword or the purse.” It relies entirely on its institutional reputation and the compliance of the executive branch to enforce its decrees.

This complex dynamic is best illustrated by three landmark milestones:

Landmark Milestones in Judicial Power

4. The Limits: The System of Checks and Balances

The Court has no army or budget (“no sword or purse”). It relies on other branches for enforcement and relies on Congress to fix statutory misinterpretations.

Check #1: Congress Can Rewrite the Law

If the Court interprets a statutory law in a way Congress dislikes, lawmakers can simply change the law.

Example: In Ledbetter v. Goodyear Tire & Rubber Co. (2007), the Court dismissed a gender pay discrimination suit because the plaintiff filed her claim years after the initial discriminatory pay decision, missing the strict 180-day statutory window. Congress responded in 2009 by passing the Lilly Ledbetter Fair Pay Act, which clarified that the 180-day clock resets with every single unfair paycheck.

Check #2: Congress and the States Can Amend the Constitution

When the Court bases a ruling on the Constitution itself, standard legislation cannot override it. The ultimate remedy is a constitutional amendment.

Example: In Dred Scott v. Sandford (1857), the Court disastrously ruled that Black individuals could not be U.S. citizens and that Congress could not prohibit slavery in U.S. territories. Following the Civil War, the nation permanently nullified this ruling by ratifying the 14th Amendment, which guarantees citizenship to all persons born or naturalized in the United States.

Check #3: The President Must Enforce the Rulings

Because the Court commands no military or police presence, it depends entirely on the Executive Branch to give its words teeth.

Example: Following the Brown v. Board of Education ruling, several Southern governors openly defied integration. The ruling only became a reality in 1957 when President Dwight D. Eisenhower deployed the U.S. Army’s 101st Airborne Division to Little Rock, Arkansas, to protect and escort nine Black students into their high school.

Frequently Asked Questions About the Court

Can Congress increase the size of the Supreme Court?

Yes. The Constitution doesn’t set the number at nine. Congress changed the size six times before settling on nine in 1869. While “court-packing” is controversial, some argue the bench size should match the number of federal circuits (currently 13).

Can Supreme Court justices be impeached and removed?

Yes. Justices serve “during good behavior” and can be impeached by the House and removed by the Senate. Only one justice (Samuel Chase, 1804) was ever impeached; he was acquitted, setting a precedent that rulings alone aren’t grounds for removal. However, Justice Abe Fortas resigned in 1969 under the threat of impeachment due to a financial scandal involving an improper $20,000 fee from a private foundation.

What Comes Next?

Understanding the structural mechanics of the Supreme Court is only the first step. The deeper questions lie in how this power has been wielded throughout American history.

• What happens when the Court’s judicial philosophies lean too far out of step with the public?
• Which specific decisions stand as the most consequential triumphs—or greatest failures—in our national narrative?

In the next installment of our Politics 101 series, we will explore the Most Important Supreme Court Cases That Changed America, examining the dramatic human stories and legal battles that redefined the nation.

Core Mechanics at a Glance