Political philosophies of Smith, Rousseau, Hume and Locke have been influential not only for development of American political system, but also for many diverse issues. These philosophers promoted enlightenment, and as result advocated for major tenets such as freedom, human reason, natural rights and democracy that formed cornerstone of the modern society. Among these great philosophers, Smith played a crucial role for the development of free market under capitalism since this was thought to promote invention. John Locke is remembered for he developed principles on which American political system was founded.