Simply, if the case arises under federal statute or is a case of constitutional interpretation federal courts will have original jurisdiction.
You don't have to bother speculating. Federal courts do not, and never will, decide divorce actions.
EXCLUSIVE
Federal cases only, meaning cases that are of interest to or in which the United States has been aggrieved.
Federal courts may hear civil cases or criminal cases.
State courts hear far more cases than federal courts.
Yes, federal courts do not have jurisdiction over divorce cases. Divorce cases are typically handled in state courts.
Courts that have the authority to be the first courts in which most federal cases are heard are known as district courts. These are the trial courts of the federal judiciary system and are responsible for hearing both civil and criminal cases.
All I can say is it is not State Courts (Sorry GradPoint users)
District courts hear cases on topics assigned to them by Congress, and federal courts hear cases regarding constitutional law and treaties.
All federal courts hear cases on appeal or original jurisdiction cases.
Cases involving federal law.
Federal courts of general jurisdiction (US District Courts, etc.) handle both civil and criminal cases.