The House of Representatives is the lower house in the United States’ Legislative Branch. The American Legislative Branch operates as a bicameral legislature, with an upper house (The Senate) and a lower house (The House of Representatives).

The structure of Congress and the powers reserved for Congress are established in Article I of the Constitution.

The House of Representatives may bring charges of impeachment against a President, and if the vote carries, he is tried for impeachment in the Senate. Only two Presidents have ever had charges of impeachment brought against them by the House (Andrew Johnson and Bill Clinton), but neither were found guilty in the Senate.

Pork-barrel legislation is the name given by any attempt, successful or otherwise, by a representative to gain some benefit for his or her home district at the expense of national interests.

The Supreme Court case, Marbury v. Madison (1803) is the most important of the early Supreme Court cases. It established the power of Judicial Review, which states that the Supreme Court has the right to declare an act of Congress unconstitutional. It greatly expanded the power of the infant Judicial Branch and further entrenched the doctrine of checks and balances that is at the heart of the American political system.

The term Judicial Activism, or Judicial Intervention, is used to describe the belief that the Supreme Court should take an active and promiment role in shaping American national policies. It is the antonym of judicial restraint, which suggests that the Supreme Court should limit its attempts to intervene in shaping national policies.

Judicial Review is one of the more important powers of the Supreme Court and the Judicial Branch of the United States government. It was established in the Supreme Court case of Marbury v. Madison, in 1803. It allows the Supreme Court to declare an act of Congress unconstitutional, giving the Judicial Branch the ability to check the power of the Legislative Branch.

Being a Justice on the Supreme Court is a tenured position. This means Justices cannot be removed from office by either the President or by Congress. They are effectively in power for life, or until they decide to retire.

There were originally six Supreme Court Justices. This was quickly changed to seven in 1807, to prevent the obvious problem of there being frequent ties. In 1837, the number of Justices was expanded to nine, where it has remained—apart from a brief time with ten—ever since.

During the Great Depression, Franklin D. Roosevelt met with a lot of opposition from the Supreme Court, which ruled that many of his policies were in violation of the Constitution and attempted to take the powers of the government and the Presidency too far. To try to remedy this situation, Roosevelt attempted to expand the number of Supreme Court Justices to give himself a majority of supporters on the Court; this was of course met with a great deal of opposition, and is now known as "court packing."