Final answer:
The U.S. Supreme Court has the authority to overrule decisions of federal appeals courts and serves as the final court of appeal in the United States.
Step-by-step explanation:
The court that has the power to overrule the decision of a federal appeals court is the U.S. Supreme Court. As the highest court in the United States, the Supreme Court serves as the final court of appeal and has the authority to review and overturn decisions made by the lower federal courts, including the U.S. Courts of Appeals. The Supreme Court's decisions are binding on all lower courts, and its precedent sets guidelines for legal interpretation across the nation.