Political philosopher's name?

"... During the Enlightenment period, new theories about what the human was and is and about the definition of reality and the way it was perceived, along with the discovery of other societies in the Americas, and the changing needs of political societies (especially in the wake of the English Civil War, the American Revolution and the French Revolution) led to new questions and insights by such thinkers as Jean-Jacques Rousseau, Montesquieu and John Locke. ..."