“
Once the Constitution was ratified, Congress quickly turned to the task of setting up a court system within the Article III framework. The Judiciary Act of 1789, often called the First Judiciary Act, established two tiers of lower courts: thirteen district courts that followed state lines, each with its own district judge, and three circuit courts, for the Eastern, Middle, and Southern Circuits.
”
”
Linda Greenhouse (The U.S. Supreme Court: A Very Short Introduction (Very Short Introductions))