The executive branch is headed by the president, who must be a natural-born citizen of the United States, at least 35 years old, and a resident of the country for at least 14 years. A president is elected indirectly by the people through the Electoral College system to a four-year term and is limited to two elected terms of office by the Twenty-second Amendment (1951). The president’s official residence and office is the White House, located at 1600 Pennsylvania Avenue N.W. in Washington, D.C. The formal constitutional responsibilities vested in the presidency of the United States include serving as commander in chief of the armed forces; negotiating treaties; appointing federal judges, ambassadors, and cabinet officials; and acting as head of state. In practice, presidential powers have expanded to include drafting legislation, formulating foreign policy, conducting personal diplomacy, and leading the president’s political party.

The members of the president’s cabinet—the attorney general and the secretaries of State, Treasury, Defense, Homeland Security, Interior, Agriculture, Commerce, Labor, Health and Human Services, Housing and Urban Development, Transportation, Education, Energy, and Veterans Affairs—are appointed by the president with the approval of the Senate; although they are described in the Twenty-fifth Amendment as “the principal officers of the executive departments,” significant power has flowed to non-cabinet-level presidential aides, such as those serving in the Office of Management and Budget (OMB), the Council of Economic Advisers, the National Security Council (NSC), and the office of the White House Chief of Staff; cabinet-level rank may be conferred to the heads of such institutions at the discretion of the president. Members of the cabinet and presidential aides serve at the pleasure of the president and may be dismissed by him at any time.

The executive branch also includes independent regulatory agencies such as the Federal Reserve System and the Securities and Exchange Commission. Governed by commissions appointed by the president and confirmed by the Senate (commissioners may not be removed by the president), these agencies protect the public interest by enforcing rules and resolving disputes over federal regulations. Also part of the executive branch are government corporations (e.g., the Tennessee Valley Authority, the National Railroad Passenger Corporation [Amtrak], and the U.S. Postal Service), which supply services to consumers that could be provided by private corporations, and independent executive agencies (e.g., the Central Intelligence Agency, the National Science Foundation, and the National Aeronautics and Space Administration), which comprise the remainder of the federal government.

The legislative branch

The U.S. Congress, the legislative branch of the federal government, consists of two houses: the Senate and the House of Representatives. Powers granted to Congress under the Constitution include the power to levy taxes, borrow money, regulate interstate commerce, impeach and convict the president, declare war, discipline its own membership, and determine its rules of procedure.

With the exception of revenue bills, which must originate in the House of Representatives, legislative bills may be introduced in and amended by either house, and a bill—with its amendments—must pass both houses in identical form and be signed by the president before it becomes law. The president may veto a bill, but a veto can be overridden by a two-thirds vote of both houses. The House of Representatives may impeach a president or another public official by a majority vote; trials of impeached officials are conducted by the Senate, and a two-thirds majority is necessary to convict and remove the individual from office. Congress is assisted in its duties by the General Accounting Office (GAO), which examines all federal receipts and expenditures by auditing federal programs and assessing the fiscal impact of proposed legislation, and by the Congressional Budget Office (CBO), a legislative counterpart to the OMB, which assesses budget data, analyzes the fiscal impact of alternative policies, and makes economic forecasts.

The House of Representatives is chosen by the direct vote of the electorate in single-member districts in each state. The number of representatives allotted to each state is based on its population as determined by a decennial census; states sometimes gain or lose seats, depending on population shifts. The overall membership of the House has been 435 since the 1910s, though it was temporarily expanded to 437 after Hawaii and Alaska were admitted as states in 1959. Members must be at least 25 years old, residents of the states from which they are elected, and previously citizens of the United States for at least seven years. It has become a practical imperative—though not a constitutional requirement—that a member be an inhabitant of the district that elects him. Members serve two-year terms, and there is no limit on the number of terms they may serve. The speaker of the House, who is chosen by the majority party, presides over debate, appoints members of select and conference committees, and performs other important duties; he is second in the line of presidential succession (following the vice president). The parliamentary leaders of the two main parties are the majority floor leader and the minority floor leader. The floor leaders are assisted by party whips, who are responsible for maintaining contact between the leadership and the members of the House. Bills introduced by members in the House of Representatives are received by standing committees, which can amend, expedite, delay, or kill legislation. Each committee is chaired by a member of the majority party, who traditionally attained this position on the basis of seniority, though the importance of seniority has eroded somewhat since the 1970s. Among the most important committees are those on Appropriations, Ways and Means, and Rules. The Rules Committee, for example, has significant power to determine which bills will be brought to the floor of the House for consideration and whether amendments will be allowed on a bill when it is debated by the entire House.

Each state elects two senators at large. Senators must be at least 30 years old, residents of the state from which they are elected, and previously citizens of the United States for at least nine years. They serve six-year terms, which are arranged so that one-third of the Senate is elected every two years. Senators also are not subject to term limits. The vice president serves as president of the Senate, casting a vote only in the case of a tie, and in his absence the Senate is chaired by a president pro tempore, who is elected by the Senate and is third in the line of succession to the presidency. Among the Senate’s most prominent standing committees are those on Foreign Relations, Finance, Appropriations, and Governmental Affairs. Debate is almost unlimited and may be used to delay a vote on a bill indefinitely. Such a delay, known as a filibuster, can be ended by three-fifths of the Senate through a procedure called cloture. Treaties negotiated by the president with other governments must be ratified by a two-thirds vote of the Senate. The Senate also has the power to confirm or reject presidentially appointed federal judges, ambassadors, and cabinet officials.

The judicial branch

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The judicial branch is headed by the Supreme Court of the United States, which interprets the Constitution and federal legislation. The Supreme Court consists of nine justices (including a chief justice) appointed to life terms by the president with the consent of the Senate. It has appellate jurisdiction over the lower federal courts and over state courts if a federal question is involved. It also has original jurisdiction (i.e., it serves as a trial court) in cases involving foreign ambassadors, ministers, and consuls and in cases to which a U.S. state is a party.

Most cases reach the Supreme Court through its appellate jurisdiction. The Judiciary Act of 1925 provided the justices with the sole discretion to determine their caseload. In order to issue a writ of certiorari, which grants a court hearing to a case, at least four justices must agree (the “Rule of Four”). Three types of cases commonly reach the Supreme Court: cases involving litigants of different states, cases involving the interpretation of federal law, and cases involving the interpretation of the Constitution. The court can take official action with as few as six judges joining in deliberation, and a majority vote of the entire court is decisive; a tie vote sustains a lower-court decision. The official decision of the court is often supplemented by concurring opinions from justices who support the majority decision and dissenting opinions from justices who oppose it.

Because the Constitution is vague and ambiguous in many places, it is often possible for critics to fault the Supreme Court for misinterpreting it. In the 1930s, for example, the Republican-dominated court was criticized for overturning much of the New Deal legislation of Democratic President Franklin D. Roosevelt. In the area of civil rights, the court has received criticism from various groups at different times. Its 1954 ruling in Brown v. Board of Education of Topeka, which declared school segregation unconstitutional, was harshly attacked by Southern political leaders, who were later joined by Northern conservatives. A number of decisions involving the pretrial rights of prisoners, including the granting of Miranda rights and the adoption of the exclusionary rule, also came under attack on the ground that the court had made it difficult to convict criminals. On divisive issues such as abortion, affirmative action, school prayer, and flag burning, the court’s decisions have aroused considerable opposition and controversy, with opponents sometimes seeking constitutional amendments to overturn the court’s decisions.

At the lowest level of the federal court system are district courts (see United States District Court). Each state has at least one federal district court and at least one federal judge. District judges are appointed to life terms by the president with the consent of the Senate. Appeals from district-court decisions are carried to the U.S. courts of appeals (see United States Court of Appeals). Losing parties at this level may appeal for a hearing from the Supreme Court. Special courts handle property and contract damage suits against the United States (United States Court of Federal Claims), review customs rulings (United States Court of International Trade), hear complaints by individual taxpayers (United States Tax Court) or veterans (United States Court of Appeals for Veteran Claims), and apply the Uniform Code of Military Justice (United States Court of Appeals for the Armed Forces).