Because of the federalist underpinnings of the division between sovereign federal and state governments, the various state court systems are free to operate in ways that vary widely from those of the federal government, and from one another.
A few states have two separate supreme courts, with one having authority over civil matters and the other reviewing criminal cases.
[1] The U.S. federal court system hears cases involving litigants from two or more states, violations of federal laws, treaties, and the Constitution, admiralty, bankruptcy, and related issues.
[1] The civil cases often involve civil rights, patents, and Social Security while the criminal cases involve tax fraud, robbery, counterfeiting, and drug crimes.
Several Hollywood films such as A Few Good Men (1992) and Runaway Jury (2003) are set around its courts.