Book excerpt: "The U.S. civil court system consists of three levels: 1) District Courts ("Trial Courts"), 2) Circuit Courts of Appeal ("appellate courts") and 3) the Supreme Court (see Figure 1.1). The United States has a total of 94 districts, representing distinct geographic regions (see Table 1.1). The number of districts varies by state. For instance, some states have only one district (e.g., Arizona, Colorado, Delaware), while others have multiple districts, such as California, Florida, and Michigan (e.g., Southern District of California, Central District of California)"--