Is there an independent basis for federal jurisdiction if both claims arise from the same event but involve parties from the same state?

The correct answer highlights a foundational principle in federal jurisdiction. When both claims arise from the same event and involve parties from the same state, there cannot be an independent basis for federal jurisdiction solely relying on diversity of citizenship. For federal jurisdiction through diversity, parties must be from different states. Thus, if all parties are from the same state, diversity jurisdiction is not established, which directly impacts the ability to bring claims in federal court based on diversity grounds.

Other potential bases for federal jurisdiction, such as federal question jurisdiction, would need to be examined separately to determine if they apply. However, the situation presented does not provide any indication of a federal question being involved, focusing strictly on the diversity of the parties. Hence, if there is no diversity due to all parties sharing the same state of citizenship, such an independent basis for federal jurisdiction cannot be established.