(Clause 1) Cases to be heard: This sets out the jurisdiction of the federal courts. It identifies those cases that may be tried in those courts. The federal courts can hear and decide a case depending on either the subject matter or the parties involved.

(Clause 2) Supreme Court Jurisdiction: Gives the Supreme Court both original and appellate jurisdiction. Original jurisdiction refers to the power of a court to hear a case in the first instance. Appellate refers to a courts power to hear a case on appeal from a lower court, from the court in which the case was originally tried.

(Clause 3) Jury trial in criminal cases: A person accused of a federal crime is guaranteed the right to trial by jury in a federal court in the state where the crime was committed.

Jurisdiction (clauses 1-3)