Provide a concise overview of the hierarchical structure of the U.S. court system. Identify the main levels of courts, including federal and state courts. Briefly describe the jurisdiction of each level and how cases move through the system.

Discuss the distinctions between federal and state courts. What types of cases typically fall under federal jurisdiction, and what types are heard in state courts? Explore the concept of concurrent jurisdiction and instances where cases may be heard in both federal and state courts.

Explore challenges or criticisms faced by the U.S. court system. Discuss potential reforms or improvements that have been proposed or implemented to address these challenges. Consider the role of technology and changes in societal expectations on the evolution of the court system.

Provide references and citations.