Definition: The National Government is organized around three separate branches. The Constitution gives to each branch its own field of governmental authority: legislative, executive, and judicial. Each branch is subject to a number of constitutional checks (restraints) by the other branches. The Congress has the power to make law, but the President may veto (reject) any act of Congress.
Application: Watergate Scandal The Watergate scandal was a major political scandal that occurred in the United States in the 1970s as a result of the June 17, 1972 break-in at the Democratic National Committee headquarters at the Watergate office complex in Washington, D.C., and the Nixon administration's attempted cover-up of its involvement. The term Watergate has come to encompass an array of clandestine and often illegal activities undertaken by members of the Nixon administration. Those activities included "dirty tricks" such as bugging the offices of political opponents and people of whom Nixon or his officials were suspicious. Nixon and his close aides ordered harassment of activist groups and political figures, using the FBI, CIA, and the internal revenue Service. The scandal led to the discovery of multiple abuses of power by the Nixon administration, articles of impeachment, and the resignation of Republican Richard Nixon, the President of the United States, on August 9, 1974—the only resignation of a U.S. president to date. The scandal also resulted in the indictment, trial, conviction, and incarceration of 43 people, dozens of whom were Nixon's top administration officials. http://www.infoplease.com/us/supreme-court/cases/ar20.html Marbury v. Madison case decided in 1803 by the U.S. Supreme Court. William Marbury had been commissioned justice of the peace in the District of Columbia by President John Adams in the "midnight appointments" at the very end of his administration. When the new administration did not deliver the commission, Marbury sued James Madison, Jefferson's Secretary of State. (At that time the Secretary of State was charged with certain domestic duties as well as with conducting foreign affairs.) Chief Justice John Marshall held that, although Marbury was entitled to the commission, the statute that was the basis of the particular remedy sought was unconstitutional because it gave the Supreme Court authority that was implicitly denied it by Article 3 of the U.S. Constitution. The decision was the first by the Supreme Court to declare unconstitutional and void an act passed by Congress that the Court considered in violation of the Constitution. The decision established the doctrine of judicial review, which recognizes the authority of courts to declare statutes unconstitutional. http://en.wikipedia.org/wiki/Marbury_v._Madison
The Civil Rights Act of 1964 The Civil Rights Act of 1964 is the nation's benchmark civil rights legislation, and it continues to resonate in America. The Civil Rights Act of 1964 prohibits discrimination on the basis of race, color, religion, sex or national origin. Passage of the Act ended the application of "Jim Crow" laws, which had been upheld by the Supreme Court in the 1896 case Plessy v. Ferguson, in which the Court held that racial segregation purported to be "separate but equal" was constitutional. The Civil Rights Act was eventually expanded by Congress to strengthen enforcement of these fundamental civil rights. http://www.judiciary.senate.gov/about/history/CivilRightsAct.cfm