Supreme Court History: Size, Seat, and Shadow Docket

The history of the U.S. Supreme Court is the story of how a little-noticed body with six justices and no building of its own became the most powerful court in the world. Created by Article III of the Constitution and organized by the Judiciary Act of 1789, the Court spent its first years borrowing rooms and struggling to attract members. It claimed its defining power in 1803, survived its worst self-inflicted wound in 1857, and settled into its modern shape, nine justices who hear roughly 60 to 80 argued cases each term, only after decades of congressional tinkering and one failed attempt to pack the bench.

Where the Court Came From

Article III of the Constitution created the federal judiciary in remarkably few words. It vested “the judicial Power of the United States” in “one supreme Court” and gave Congress authority to create lower federal courts whenever the need arose.¹ Almost every structural detail was left for Congress to fill in: how many justices would sit, how the courts would be organized, what kinds of cases each level could hear.

The first Congress answered with the Judiciary Act of 1789. It created a three-tier system of district courts, circuit courts, and a Supreme Court made up of one Chief Justice and five associate justices.² The Act also imposed an exhausting duty called “circuit riding,” which required the justices to travel to assigned regions for months at a time to preside over cases in the lower courts.³ Roads were terrible, distances were enormous, and the duty persisted in some form for more than a century, until Congress finally created dedicated circuit court judgeships in 1869.

The Court held its first session on February 1, 1790, in the Exchange Building in New York City, then the national capital.³ Chief Justice John Jay had to postpone the start of business until the following day because some justices couldn’t reach New York in time.⁴ In those early years the justices spent most of their energy writing procedural rules and building administrative systems rather than issuing landmark rulings. The Court was widely seen as the weakest of the three branches.

The Decision That Changed Everything

That changed under Chief Justice John Marshall, who served from 1801 to 1835 and turned the Court into a co-equal branch of government. The defining moment came in 1803 with Marbury v. Madison, a dispute that arose when the incoming Jefferson administration refused to deliver a judicial commission signed by outgoing President John Adams.⁵

Marshall’s opinion did something no court had done before. He found that a section of the Judiciary Act of 1789 conflicted with the Constitution’s limits on the Court’s original jurisdiction, and he declared that section void. In doing so, he established the principle of judicial review: the power of the judiciary to strike down any law, federal or state, that violates the Constitution.⁵ It was a political masterstroke. Marshall avoided a direct confrontation with Jefferson (Marbury never got his commission) while claiming for the judiciary the most powerful tool in American constitutional law.

The Marshall Court built on that foundation for three decades, issuing decisions that expanded federal authority over interstate commerce, reinforced the supremacy of federal law over conflicting state law, and cemented the Court’s role as the final interpreter of the Constitution. By the time Marshall died in office in 1835, no one questioned whether the judiciary belonged at the center of American governance.

The Court’s Darkest Chapter

Judicial review is only as good as the principles behind it. In 1857, Chief Justice Roger Taney’s Court issued Dred Scott v. Sandford, a ruling many legal scholars consider the worst decision the Court has ever handed down.⁶ The case involved an enslaved man named Dred Scott, who argued that living in free territories had made him a free person.

The Court ruled against Scott and went far beyond the facts of the case. The majority held that Black people, whether enslaved or free, were not citizens of the United States and could not bring suit in federal court. The opinion also declared that Congress had no authority to prohibit slavery in federal territories, effectively striking down the Missouri Compromise.⁶ Rather than settling the slavery question, the decision inflamed it and pushed the country closer to civil war. It was eventually overturned by the Thirteenth and Fourteenth Amendments, which abolished slavery and established birthright citizenship.

How the Number of Justices Has Changed

Few people realize that the Constitution does not fix the number of justices. Congress controls it by statute, and the number has changed multiple times.⁷ The original Judiciary Act of 1789 set the bench at six. The adjustments that followed reflected political maneuvering as much as administrative need.

1801 — reduced to five. The outgoing Federalist Congress eliminated one seat effective at the next vacancy, hoping to deny the incoming Jefferson administration an appointment. Jefferson’s allies repealed the law in 1802 before any vacancy arose.⁸
1807 — expanded to seven, matching a new seventh judicial circuit covering western states.
1837 — expanded to nine as two more circuits were added.³
1863 — expanded to ten during the Civil War.⁷
1866 — reduced to seven to deny President Andrew Johnson any appointments during Reconstruction.⁷
1869 — fixed at nine, matching the nine circuits then in existence, and there it has stayed.⁹

Federal law codifies the current structure: a Chief Justice and eight associate justices, with six constituting a quorum.¹⁰

Why Nine Stuck: FDR’s Court-Packing Plan

The most serious threat to the nine-justice norm came in 1937, when President Franklin Roosevelt grew frustrated with a conservative Court that kept striking down his New Deal legislation. Roosevelt proposed the Judicial Procedures Reform Bill, which would have allowed the president to appoint one additional justice for every sitting justice over the age of 70, up to a maximum of six new seats.¹¹ The transparent goal was to pack the bench with allies.

The plan backfired. Members of Roosevelt’s own party opposed it, and the Senate tabled the bill in July 1937. Roosevelt lost significant political capital over the episode.¹¹ The failure reinforced nine as the proper size of the bench, and no president has seriously challenged it since.

A Bench That Slowly Diversified

For most of its history the Court was composed entirely of white Protestant men. The gradual diversification of the bench tracks some of the most important social changes in American life.

Louis Brandeis became the first Jewish justice in 1916, after a confirmation fight so contentious it changed the Senate’s process for evaluating nominees.¹² More than fifty years later, in 1967, President Lyndon Johnson appointed Thurgood Marshall, the civil rights lawyer who had argued Brown v. Board of Education, as the first African American justice.¹³

In 1981, President Ronald Reagan nominated Sandra Day O’Connor, who was confirmed unanimously as the first woman on the Court.¹⁴ Sonia Sotomayor joined in 2009 as the first Hispanic justice.¹⁵ In 2022, Ketanji Brown Jackson became the first Black woman to serve on the bench.

Where the Court Has Met

The Court did not have a building of its own for the first 146 years of its existence, a physical arrangement that mirrored its early status. The initial sessions in 1790 took place in New York City. When the capital moved to Philadelphia, the justices heard cases in Old City Hall from 1791 to 1800, borrowing a courtroom that belonged to the city.¹⁶

After the federal government relocated to Washington, D.C. in 1800, the Court moved into the Capitol building and occupied a series of borrowed rooms for the next 135 years, including a ground-floor chamber designed for it by Benjamin Henry Latrobe and later the Old Senate Chamber.¹⁷¹⁸ Chief Justice William Howard Taft, the only person to serve as both president and chief justice, championed the campaign for a dedicated courthouse. The current Supreme Court Building was completed in 1935 at a cost of roughly $9.4 million.¹⁹ The marble structure across the street from the Capitol gave the judiciary a physical presence equal to the other two branches for the first time.

How Confirmations Became Public

For much of American history, confirming a Supreme Court justice was a quiet affair. The Senate voted in closed executive sessions, often on the same day a nomination was received, with no public testimony and little press coverage. That began to change in 1916, when President Woodrow Wilson nominated Louis Brandeis. The backlash was so intense that the Senate Judiciary Committee took the unprecedented step of holding public hearings to evaluate the nominee.²⁰ No nominee before Brandeis had faced anything like it.

As the Court’s rulings began shaping everyday life on issues from civil rights to criminal procedure, public interest in who sat on the bench grew. The introduction of televised hearings in the late 20th century turned confirmations into national events. Modern hearings span multiple days, with senators questioning nominees about their judicial philosophy, past rulings, and views on constitutional interpretation. Federal background investigations, testimony from outside witnesses, and advocacy campaigns for and against nominees have all become standard.

Senate procedure also changed. Until 2017, Senate rules allowed a minority of senators to filibuster a Supreme Court nomination, effectively requiring 60 votes to end debate. In April 2017, the Senate majority invoked what is known as the “nuclear option,” changing the rules so that debate on Supreme Court nominees could be ended with 51 votes. The change permanently lowered the threshold for confirming justices.

How the Court Works Today

The Court’s annual term begins, by statute, on the first Monday in October and typically runs through late June or early July.²¹ The rhythm of the term runs on two parallel tracks: the merits docket of fully argued cases, and the orders docket, which covers everything else.

How Cases Get There

The vast majority of cases reach the Court through petitions for a writ of certiorari, a request asking the justices to review a lower court’s decision. The Court receives thousands of these petitions each year and accepts only a small fraction. Under an internal practice known as the “Rule of Four,” at least four of the nine justices must vote to hear a case before certiorari is granted.²² The justices tend to select cases involving disagreements among lower federal courts, important questions of federal law, or situations where a lower court’s decision conflicts with existing Supreme Court precedent. Most denied petitions receive no explanation, which means the lower court’s ruling stands.

The Shadow Docket

Outside of fully argued cases, the Court handles a large number of emergency applications, stay requests, and procedural motions through what has come to be called the “shadow docket.” These matters move on compressed timelines with shorter briefs, no oral argument, and decisions that are frequently unsigned and unexplained.²³ Emergency applications first go to the justice assigned to the relevant judicial circuit, who can act alone or refer the matter to the full Court. Critics argue that consequential legal questions deserve the full briefing and deliberation that come with the merits docket. Defenders counter that emergency relief would be meaningless if it took months to obtain.

Life Tenure and Retirement

Supreme Court justices serve “during good Behaviour,” which in practice means for life unless they choose to retire or are impeached and removed by Congress.¹ Federal law gives justices two options for stepping back. Under 28 U.S.C. § 371, a justice who meets certain age-and-service combinations can fully retire and receive an annuity equal to their salary at retirement. Alternatively, a justice can take “senior status,” stepping down from regular active service while remaining eligible to hear a reduced number of cases.²⁴ Because there is no mandatory retirement age, the timing of a departure is almost always a personal and strategic decision, and vacancies on the Court are unpredictable. That unpredictability is part of why modern confirmation battles carry such high stakes.

1
Congress.gov. U.S. Constitution – Article III
2
Yale Law School Avalon Project. Judiciary Act of 1789
3
Supreme Court of the United States. The Court as an Institution
4
United States Senate Committee on the Judiciary. The History of the Supreme Court of the United States
5
Justia U.S. Supreme Court Center. Marbury v. Madison, 5 U.S. 137 (1803)
6
National Archives. Dred Scott v. Sandford (1857)
7
Congress.gov. ArtIII.S1.8.3 Supreme Court and Congress
8
U.S. Capitol – Visitor Center. Judiciary Act of 1801
9
Federal Judicial Center. The Supreme Court of the United States and the Federal Judiciary
10
Office of the Law Revision Counsel. 28 USC 1
11
Federal Judicial Center. FDR’s Court-Packing Plan
12
U.S. Capitol – Visitor Center. Judicial Oath of Louis D. Brandeis, June 5, 1916
13
United States Courts. Justice Thurgood Marshall Profile
14
Supreme Court of the United States. Sandra Day O’Connor – Appointment to the Supreme Court
15
Justia U.S. Supreme Court Center. Justice Sonia Sotomayor
16
National Park Service. Old City Hall – Independence National Historical Park
17
Supreme Court of the United States. Building History
18
Architect of the Capitol. Old Senate Chamber
19
Architect of the Capitol. Supreme Court Building
20
U.S. Capitol – Visitor Center. Senate Resolution to Advise and Consent to the Appointment of Louis D. Brandeis
21
Office of the Law Revision Counsel. 28 USC 2
22
United States Courts. Supreme Court Procedures
23
Congress.gov. The Interim Docket or Shadow Docket – Non-Merits Orders
24
Office of the Law Revision Counsel. 28 USC 371