The Federal court systems is a system of courts that you go to if you do something really bad.It is also where people get justice and sometimes the two sides get in a conflict.So it is where you go if you are in trial for impeachment or breaking the USA lawa
Relations between federal and state courts are regulated in part by statutory rule, with regard, for example, to the interference of state courts with federal courts and the failure of state courts to cooperate with federal court judgments; in part by-laws, concerning federal law usually requiring interference of federal courts with ongoing state court proceedings; all extended to prevent unseemly disputes, which, however, have arisen at times, except in part through self-imposed laws of comity and discipline, such as the abstention doctrine.