Final answer:
Article 3, Section 1 of the United States Constitution creates the Judicial Branch and establishes the Supreme Court as the highest court in the land.
Step-by-step explanation:
Article 3, Section 1 of the United States Constitution creates the Judicial Branch and establishes the Supreme Court as the highest court in the land. It grants "all judicial power of the United States" to the Supreme Court and also gives the power to create "inferior courts", which are the lower federal courts that exist today. This section of the Constitution ensures that there is a national judiciary and provides a framework for the federal court system in the United States.