Judicial Review - The power of the Supreme Court to declare laws unconstitutional is not in the constitution yet it has become one of the basic tenants of the checks and balances system. ... As an example of how important the unwritten constitution has become one might cite the example of the two term limit.
His political philosophies form its foundation John Locke was a very famous Enlightenment philosopher featuring a plethora of individualism in both his concepts and beliefs. Hope this helps! :)
The nullification crisis was a conflict between the U.S. state of South Carolina and the federal government of the United States in 1832–33. Calhoun, who opposed the federal imposition of the tariffs of 1828 and 1832 and argued that the U.S. Constitution gave states the right to block the enforcement of a federal law.