American legal systems refer to the complex framework of laws and regulations that govern the United States, established through the Constitution, statutes, and case law. This system is rooted in principles of justice, equality, and the protection of individual rights, with key elements including federal and state courts, administrative agencies, and the influence of precedents. The system is closely tied to the concepts of selective incorporation and the 14th Amendment, which together ensure that individual rights are protected from state infringement.