The phrase “judicial branch” refers to the court system established within a system of government. In the USA, judicial branches are found in the federal, state, county, and municipal governments.
An introduction to the federal court system can be found here: https://www.uscourts.gov/about-federal-courts/court-role-and-structure
A comparison of federal and state court systems can be found here: https://www.uscourts.gov/about-federal-courts/court-role-and-structure/comparing-federal-state-courts
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