United States: Government Structure

The United States is a federal constitutional republic in which governing power is divided between a national government and the fifty individual states, each retaining its own constitution and substantial authority over matters such as education, law enforcement, and local commerce. At the federal level, the Constitution establishes three separate branches of government, each granted distinct powers and each able to check and balance the authority of the others, a structure designed to prevent any single branch from accumulating excessive control.

The legislative branch, Congress, is bicameral, consisting of the Senate, with two members from each state serving six-year terms, and the House of Representatives, whose 435 members are apportioned among the states by population and serve two-year terms. Congress holds the power to write and pass federal laws, levy taxes, and declare war. The executive branch is headed by the president, who is elected to a four-year term through the Electoral College, serves as commander-in-chief of the armed forces, and is responsible for enforcing and administering federal law with the assistance of the cabinet and federal agencies.

The judicial branch is led by the Supreme Court, whose nine justices are nominated by the president and confirmed by the Senate to serve for life, alongside a system of federal appellate and district courts. The Supreme Court holds the power of judicial review, allowing it to strike down laws or executive actions found to violate the Constitution. Beyond the federal structure, each of the fifty states maintains its own government with a governor, state legislature, and court system, and the Tenth Amendment reserves to the states or the people any powers not explicitly delegated to the federal government.