Which of the following is NOT a type of case over which federal courts have jurisdiction?

Federal courts have jurisdiction over specific types of cases as outlined in the U.S. Constitution and federal statutes. Cases arising under the U.S. Constitution are directly related to federal law, providing a jurisdictional basis for federal courts. Additionally, cases affecting ambassadors fall under federal jurisdiction because they involve international relations, which is a federal concern. Disputes between citizens of different states also fall under federal jurisdiction due to the diversity jurisdiction principle, which allows federal courts to hear cases where the parties are from different states, and the amount in controversy exceeds a certain threshold.

On the other hand, cases involving state law violations are generally under the jurisdiction of state courts unless they also involve a federal question or meet certain criteria that would warrant federal jurisdiction, such as diversity of citizenship or other specified federal statutes. This separation ensures that state matters are primarily handled by state courts unless there is a compelling reason for federal intervention. Therefore, federal courts do not typically have jurisdiction over cases that only concern violations of state law, making this the correct identification of the type of case that does not fall under federal court jurisdiction.