At the lowest level of the federal court system are district courts (
State and local government
Because the U.S. Constitution establishes a federal system, the state governments enjoy extensive authority. The Constitution outlines the specific powers granted to the national government and reserves the remainder to the states. However, because of ambiguity in the Constitution and disparate historical interpretations by the federal courts, the powers actually exercised by the states have waxed and waned over time. Beginning in the last decades of the 20th century, for example, decisions by conservative-leaning federal courts, along with a general trend favouring the decentralization of government, increased the power of the states relative to the federal government. In some areas, the authority of the federal and state governments overlap; for example, the state and federal governments both have the power to tax, establish courts, and make and enforce laws. In other areas, such as the regulation of commerce within a state, the establishment of local governments, and action on public health, safety, and morals, the state governments have considerable discretion. The Constitution also denies to the states certain powers; for example, the Constitution forbids states to enter into treaties, to tax imports or exports, or to coin money. States also may not adopt laws that contradict the U.S. Constitution.
The governments of the 50 states have structures closely paralleling those of the federal government. Each state has a governor, a legislature, and a judiciary. Each state also has its own constitution.
Mirroring the U.S. Congress, all state legislatures are bicameral except Nebraska’s, which is unicameral. Most state judicial systems are based upon elected justices of the peace (although in many states this term is not used), above whom are major trial courts, often called district courts, and appellate courts. Each state has its own supreme court. In addition, there are probate courts concerned with wills, estates, and guardianships. Most state judges are elected, though some states use an appointment process similar to the federal courts and some use a nonpartisan selection process known as the Missouri Plan.
State governors are directly elected and serve varying terms (generally ranging from two to four years); in some states, the number of terms a governor may serve is limited. The powers of governors also vary, with some state constitutions ceding substantial authority to the chief executive (such as appointment and budgetary powers and the authority to veto legislation). In a few states, however, governors have highly circumscribed authority, with the constitution denying them the power to veto legislative bills.
Most states have a lieutenant governor, who is often elected independently of the governor and is sometimes not a member of the governor’s party. Lieutenant governors generally serve as the presiding officer of the state Senate. Other elected officials commonly include a secretary of state, state treasurer, state auditor, attorney general, and superintendent of public instruction.
State governments have a wide array of functions, encompassing conservation, highway and motor vehicle supervision, public safety and corrections, professional licensing, regulation of agriculture and of intrastate business and industry, and certain aspects of education, public health, and welfare. The administrative departments that oversee these activities are headed by the governor.