This document provides an overview of the U.S. legal system, including various theories of law, the goals of the current legal system, and definitions of key concepts. It discusses how law has evolved from early societies through Roman and English common law to the current American system. It describes the state and federal court structures, with three levels of jurisdiction at each - lower courts, appellate courts, and a highest court. The document also distinguishes between criminal and civil law, outlining differences in burden of proof and jurisdiction.