a. Moderate and Radical
Besides identifying dominant themes running throughout the Enlightenment period, some historians, such as Henry May and Jonathan Israel, understand Enlightenment thought as divisible into two broad categories, each reflecting the content and intensity of ideas prevalent at the time.  The moderate Enlightenment signifies commitments to economic liberalism, religious toleration and constitutional politics.  In contrast to its moderate incarnation, the radical Enlightenment conceives enlightened thought through the prism of revolutionary rhetoric and classical Republicanism.  Some commentators argue that the British Enlightenment (especially figures such as James Hutton, Adam Ferguson and Adam Smith) was essentially moderate, while the French (represented by Denis Diderot, Claude Adrien Helvétius and François Marie Arouet) was decidedly more radical.  Influenced as it was by the British and French, American Enlightenment thought integrates both moderate and radical elements.b. Chronology
American Enlightenment thought can also be appreciated chronologically, or in terms of three temporal stages in the development of Enlightenment Age thinking.  The early stage stretches from the time of the Glorious Revolution of 1688 to 1750, when members of Europe’s middle class began to break free from the monarchical and aristocratic regimes—whether through scientific discovery, social and political change or emigration outside of Europe, including America.  The middle stage extends from 1751 to just a few years after the start of the American Revolution in 1779. It is characterized by an exploding fascination with science, religious revivalism and experimental forms of government, especially in the United States.  The late stage begins in 1780 and ends with the rise of Napoléon Bonaparte, as the French Revolution comes to a close in 1815—a period in which the European Enlightenment was in decline, while the American Enlightenment reclaimed and institutionalized many of its seminal ideas.  However, American Enlightenment thinkers were not always of a single mind with their European counterparts.  For instance, several American Enlightenment thinkers—particularly James Madison and John Adams, though not Benjamin Franklin—judged the French philosophes to be morally degenerate intellectuals of the era.c. Democracy and the Social Contract
Many European and American Enlightenment figures were critical of democracy.  Skepticism about the value of democratic institutions was likely a legacy of Plato’s belief that democracy led to tyranny and Aristotle’s view that democracy was the best of the worst forms of government.  John Adams and James Madison perpetuated the elitist and anti-democratic idea that to invest too much political power in the hands of uneducated and property-less people was to put society at constant risk of social and political upheaval.  Although several of America’s Enlightenment thinkers condemned democracy, others were more receptive to the idea of popular rule as expressed in European social contract theories.  Thomas Jefferson was strongly influenced by John Locke’s social contract theory, while Thomas Paine found inspiration in Jean-Jacques Rousseau’s.  In the Two Treatises on Government (1689 and 1690), Locke argued against the divine right of kings and in favor of government grounded on the consent of the governed; so long as people would have agreed to hand over some of their liberties enjoyed in a pre-political society or state of nature in exchange for the protection of basic rights to life, liberty and property.  However, if the state reneged on the social contract by failing to protect those natural rights, then the people had a right to revolt and form a new government. Perhaps more of a democrat than Locke, Rousseau insisted in The Social Contract (1762) that citizens have a right of self-government, choosing the rules by which they live and the judges who shall enforce those rules. If the relationship between the will of the state and the will of the people (the “general will”) is to be democratic, it should be mediated by as few institutions as possible.2. Six Key Ideas
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