Final answer:
A case that involves questions of both federal and state law can be brought in either state or federal court, which is known as concurrent jurisdiction. This dual court system allows for certain cases, especially those involving federal questions or diverse citizenship, to be heard at either level.
Step-by-step explanation:
A case involving questions of both federal and state law may be brought in state or federal court. This is because the U.S. judicial system is a dual court system with both federal and state levels, which allows for certain cases to be heard in either jurisdiction. Cases that can be heard in either the state or federal courts, such as those involving diverse citizenship or federal questions like Constitutional issues, federal law, or treaties, are said to have concurrent jurisdiction. Moreover, cases that originate in state courts can sometimes make their way to the federal courts if they involve a federal question and all avenues of appeal in the state courts have been exhausted.