
If you’re like me, the last time you gave any serious consideration to The Enlightenment was when you were in college. Even then, it seemed to me that it was a bunch of old men in powdered wigs sitting around saying painfully obvious things like, “I think, therefore I am”.
The more I learn about the American Revolution, the more I’ve come to realize that The Enlightenment was not the irrelevant philosophical exercise that I thought it was. It is, in fact, the basis for most modern social, political, and economic thought.
OK, What Exactly Was The Enlightenment?
It was an intellectual movement that began principally in Europe during the 17th and 18th centuries. It emphasized reason, science, liberty, and skepticism of inherited authority. Some of the smartest people in Europe reexamined everything they thought they knew. They questioned the nature of God, the foundations of knowledge, the rights of individuals and how they related to the purpose of government, and the relationships between the people with power and those without. Underneath it all was the core belief in the possibility of human progress.
Elements of the Enlightenment
There are several key elements that define The Enlightenment. Probably the most important was an almost religious devotion to the supremacy of reason. Prior to this, most Europeans accepted that the ultimate authorities in the world were the church and the monarchy. Enlightenment thinkers were the first to question those authorities. They argued that a human mind with its ability for observation, logic, and evaluation of evidence could discover the truth without having it dictated by the church or the king. They didn’t necessarily reject religion, but they questioned superstition, intolerance, and blind obedience. They thought that reason gave people the power to understand the universe and improve the human condition.
Closely related to this was their belief in empiricism and the scientific method. The Enlightenment came soon after the Scientific Revolution and was influenced by figures such as Isaac Newton who demonstrated that nature operated according to principles that could be discovered and understood and that true understanding came from observable experience rather than from inherited doctrine. René Descartes, whom I quoted somewhat cavalierly in my opening paragraph, is sometimes recognized as the philosophical godfather of the Enlightenment. His landmark work Discourse on the Method, published in 1637, gave rise to the practice of rejecting any belief that couldn’t be verified by rigorous inquiry.
Another central element is the belief in the natural rights of humanity. They believed that all people possess certain rights bestowed by nature. These include life, liberty, property, and security and that all people possess these rights simply because they live. Central to this is the idea that no government had granted those rights and therefore no government can legitimately revoke them. They viewed this as an implicit social contract between rulers and the people and not a gift of a sovereign. The key element of this idea is that the people could, at any time, withdraw their consent and reconstitute the government.
Other key elements of the Enlightenment included skepticism towards authority, and a questioning of the scripture as the final word on nature. They disputed the divine rights of kings. They also stressed religious toleration and proposed the conscience should not be coerced by the state. They had a strong belief in the ability of civilization to progress through education, science, and political reform. While all enlightenment thinkers did not have the exact same specific beliefs, they believed in the core element of the value of the improvement of humanity.
Who’s Who in The Enlightenment and the Revolution
There were many writers, scientists, and philosophers associated with The Enlightenment. They range from Adam Smith and his economic theories to Voltaire and his theories of tolerance and free thought. In an essay such as this it would be impossible for me to do justice to all these great thinkers. I’m going to focus on the two I believe had the greatest impact on the American Revolution: John Locke and Charles- Louise de Secondat, Baron de Montesquieu.
Locke was a physician, philosopher and political theorist and his works probably had a greater influence on revolutionary thought than those of anyone else. His central argument was that all individuals have a natural right to life, liberty and property and that those rights exist independent of any government and that no government possesses the right to violate them.
Montesquieu was a French judge and political philosopher whom many view as the architect of separation of powers. He wrote that tyranny is best prevented by dividing governmental authority among distinct branches—executive, legislative, and judicial—and that each will check the power of the other.
Likewise, almost every central player in the American Revolution was familiar with the works of The Enlightenment writers. I’m going to focus on the two whose work, I believe, most obviously reflects the thoughts of The Enlightenment, Thomas Jefferson and James Madison.
Jefferson, Locke, and the Declaration of Independence
Thomas Jefferson is, arguably, the member of the revolutionary generation most identified with the philosophy of John Locke. Other colonial writers such as George Mason in his June1776 Virginia Declaration of Rights and Samuel Adams in his 1772 The Rights of the Colonists, clearly reflected Lockean principles. In fact, Adams specifically mentioned Locke in his treatise. But it is Jefferson in his Declaration of Independence whose relationship to John Locke is most familiar to the American people.
Locke argued that all individuals possess natural rights that include life, liberty, and property and that governments exist solely to protect those rights. Jefferson incorporated Locke’s ideas almost in verbatim into the Declaration’s most famous passage excepting that he substituted “the pursuit of happiness” for Locke’s “property”. Jefferson likely intended to broaden the appeal of his arguments beyond just protection of wealthy landowners to include more universal human rights. The Declaration also included other elements that reflected Locke’s thoughts such as a listing of violations by the British government that caused it to forfeit its legitimate authority. Jefferson had turned Locke’s social contract theory into a statement of grievances against the British monarchy.
I think it’s also important to note that not all historians agree that John Locke was the sole or even principal influence on Jefferson’s thinking in the Declaration. Other enlightenment philosophers thought to have influenced Jefferson include Francis Hutchinson, Montesquieu, and Jean-Jacques Rousseau. Jefferson himself identified the ancient philosophers Aristotle and Cicero as being intellectual sources.
Some historians have proposed that the inclusion of Locke’s ideas in the Declaration of Independence was less the result of a deep philosophical study on the part of Jefferson then a recognition that Locke’s ideas had become widely accepted in the colonies by the 1770s. Jefferson himself later wrote that the declaration wasn’t meant to be a new philosophy but to reflect the “common sense of the subject”. Regardless of whether the influence was direct or indirect, I find it difficult not to see the ideas of John Locke throughout the Declaration of Independence.
James Madison, Montesquieu, and the Constitution
Montesquieu laid out his ideas for the separation of powers in his 1748 treatise The Spirit of the Laws. He was concerned that whoever holds power will tend to abuse it. He believed that the best protection for liberty is dividing governmental power among three co-equal groups: those who make the law (legislative), those who carry out the law (executive), and those who judge disputes (judicial). He further believed that if one of these groups held excessive power, freedom would be endangered because the same person could write laws to their own benefit, then enforce those laws as they saw fit and then render judgments in their own favor.
James Madison has often been called the “father of the Constitution”. I’ve never thought that was a very accurate description, mainly because I’m not sure what it means. There was no single author of the Constitution, it was a group effort that was based on compromise, debate, bargaining, threats, and endless rewriting.
I would call Madison the architect of the Constitution. While he didn’t come up with the idea of the three branches of government, it had been in wide circulation in the colonies for several years, he showed up at the Constitutional Convention with a plan. As a result, the convention wound up debating his plan as the basis for a new constitution. Madison’s “Virginia Plan” underwent extensive revisions at the hands of the convention, but its basic structure of three coequal branches of government, reflecting Montesquieu’s ideas, remained intact.
The Legacy of the Enlightenment
The Enlightenment had a profound effect on both political and intellectual thought in the western world. It influenced not only the American Revolution but later the French Revolution. Though largely unrecognized by other revolutionaries at the time, its philosophy influenced democratic movements around the world.
The ideas of constitutional government with its principles of freedom of speech, religious liberty, and human rights all trace directly back to Enlightenment ideas. The Enlightenment did have its own problems. Many of the thinkers, reflecting the social and political mores of the 17th and 18th centuries, excluded women, enslaved Africans, indigenous people, and the lower social and economic classes from their ideas of political and social equality. Perhaps ironically, their emphasis on reason and human progress eventually began to bring these other groups into full membership in democratic society.
Unfortunately, many of the Enlightenment principles that underpin our system of government are currently under attack by politicians and oligarchs attempting to consolidate their own power and wealth.
Image generated by author using ChatGPT.
Sources
Britannica: The Enlightenment
Wikipedia: Enlightenment Philosophy
Wikipedia: Age of Enlightenment
World History Encyclopedia: 12 Key Enlightenment Philosophers
Britannica: Key Figures of the Enlightenment
Britannica: John Locke
Stanford Encyclopedia of Philosophy: Locke’s Political Philosophy
Internet Encyclopedia of Philosophy: John Locke
History Hit: Heroes of the Enlightenment
U.S. Army: Impact of the Enlightenment on the American Revolution
usconstitution.net: Enlightenment’s Impact on U.S. Democracy
Albert.io: The Enlightenment and the American Revolution
Vaia: Philosophy of the Declaration of Independence
UGA Press: Montesquieu and the American Constitution
Wikipedia: Influence of the American Revolution on the French Revolution






The Founding Feuds: When America’s Heroes Couldn’t Stand Each Other
By John Turley
On February 6, 2026
In Commentary, History, Politics
The mythology of the founding fathers often portrays them as a harmonious band of brothers united in noble purpose. The reality was far messier—these brilliant, ambitious men engaged in bitter personal feuds that sometimes threatened the very republic they were creating. In some ways, the American revolution was as much of a battle of egos as it was a war between King and colonists.
The Revolutionary War Years: Hancock, Adams, and Washington’s Critics
The tensions began even before independence was declared. John Hancock and Samuel Adams, both Massachusetts firebrands, developed a rivalry that simmered throughout the Revolution. Adams, the older political strategist, had been the dominant figure in Boston’s resistance movement. When Hancock—wealthy, vain, and eager for glory—was elected president of the Continental Congress in 1775, the austere Adams felt his protégé had grown too big for his britches. Hancock’s request for a leave of absence from the presidency of Congress in 1777 coupled with his desire for an honorific military escort home, struck Adams as a relapse into vanity. Adams even opposed a resolution of thanks for Hancock’s service, signaling open estrangement. Their relationship continued to deteriorate to the point where they barely spoke, with Adams privately mocking Hancock’s pretensions and Hancock using his position to undercut Adams politically.
The choice of Washington as commander sparked its own controversies. John Adams had nominated Washington, partly to unite the colonies by giving Virginia the top military role. Washington’s command was anything but universally admired and as the war dragged on with mixed results many critics emerged.
After the victory at Saratoga in 1777, General Horatio Gates became the focal point of what’s known as the Conway Cabal—a loose conspiracy aimed at having Gates replace Washington as commander-in-chief. General Thomas Conway wrote disparaging letters about Washington’s military abilities. Some members of Congress, including Samuel Adams, Thomas Mifflin, and Richard Henry Lee, questioned whether Washington’s defensive strategy was too cautious and if his battlefield performance was lacking. Gates himself played a duplicitous game, publicly supporting Washington while privately positioning himself as an alternative.
When Washington discovered the intrigue, his response was characteristically measured but firm. Rather than lobbying Congress or forming a counter-faction, Washington leaned heavily on reputation and restraint. He continued to communicate respectfully with Congress, emphasizing the army’s needs rather than defending his own position. Washington did not respond with denunciations or public accusations. Instead, he handled the situation largely behind the scenes. When he learned that Conway had written a critical letter praising Gates, Washington calmly informed him that he was aware of the letter—quoting it verbatim.
The conspiracy collapsed, in part because Washington’s personal reputation with the rank and file and with key political figures proved more resilient than his critics had anticipated. But the episode exposed deep fractures over strategy, leadership, and regional loyalties within the revolutionary coalition.
The Ideological Split: Hamilton vs. Jefferson and Madison
Perhaps the most consequential feud emerged in the 1790s between Alexander Hamilton and Thomas Jefferson, with James Madison eventually siding with Jefferson. This wasn’t just personal animosity—it represented a fundamental disagreement about America’s future.
Hamilton, Washington’s Treasury Secretary, envisioned an industrialized commercial nation with a strong central government, a national bank, and close ties to Britain. Jefferson, the Secretary of State, championed an agrarian republic of small farmers with minimal federal power and friendship with Revolutionary France. Their cabinet meetings became so contentious that Washington had to mediate. Hamilton accused Jefferson of being a dangerous radical who would destroy public credit. Jefferson called Hamilton a monarchist who wanted to recreate British aristocracy in America.
The conflict got personal. Hamilton leaked damaging information about Jefferson to friendly newspapers. Jefferson secretly funded a journalist, James Callender, to attack Hamilton in print. When Hamilton’s extramarital affair with Maria Reynolds became public in 1797, Jefferson’s allies savored every detail. The feud split the nation into the first political parties: Hamilton’s Federalists and Jefferson’s Democratic-Republicans. Madison, once Hamilton’s ally in promoting the Constitution, switched sides completely, becoming Jefferson’s closest political partner and Hamilton’s implacable foe.
The Adams-Jefferson Friendship, Rivalry, and Reconciliation
John Adams and Thomas Jefferson experienced one of history’s most remarkable personal relationships. They were close friends during the Revolution, working together in Congress and on the committee to draft the Declaration of Independence (though Jefferson did the actual writing). Both served diplomatic posts in Europe and developed deep mutual respect.
But the election of 1796 turned them into rivals. Adams won the presidency with Jefferson finishing second, making Jefferson vice president under the original constitutional system—imagine your closest competitor becoming your deputy. By the 1800 election, they were bitter enemies. The campaign was vicious, with Jefferson’s supporters calling Adams a “hideous hermaphroditical character” and Adams’s allies claiming Jefferson was an atheist who would destroy Christianity.
Jefferson won in 1800, and the two men didn’t speak for over a decade. Their relationship was so bitter that Adams left Washington early in the morning, before Jefferson’s inauguration. What makes their story extraordinary is the reconciliation. In 1812, mutual friends convinced them to resume correspondence. Their letters over the next fourteen years—158 of them—became one of the great intellectual exchanges in American history, discussing philosophy, politics, and their memories of the Revolution. Both men died on July 4, 1826, the fiftieth anniversary of the Declaration of Independence, with Adams’s last words reportedly being “Thomas Jefferson survives” (though Jefferson had actually died hours earlier).
Franklin vs. Adams: A Clash of Styles
In Paris, the relationship between Benjamin Franklin and John Adams was a tense blend of grudging professional reliance and deep personal irritation, rooted in radically different diplomatic styles and temperaments. Franklin, already a celebrated figure at Versailles, cultivated French support through charm, sociability, and patient maneuvering in salons and at court, a method that infuriated Adams. He equated such “nuances” with evasiveness and preferred direct argument, formal memorandums, and hard‑edged ultimatums. Sharing lodgings outside Paris only intensified Adams’s resentment as he watched Franklin rise late, receive endless visitors, and seemingly mix pleasure with business, leading Adams to complain that nothing would ever get done unless he did it himself, while Franklin privately judged Adams “always an honest man, often a wise one, but sometimes and in some things, absolutely out of his senses.” Their French ally, Foreign Minister Vergennes, reinforced the imbalance by insisting on dealing primarily with Franklin and effectively sidelining Adams in formal diplomacy. This deepened Adams’s sense that Franklin was both overindulged by the French and insufficiently assertive on America’s behalf. Yet despite their mutual loss of respect, the two ultimately cooperated—often uneasily—in the peace negotiations with Britain, and both signatures appear on the 1783 Treaty of Paris, a testament to the way personal feud and shared national purpose coexisted within the American diplomatic mission.
Hamilton and Burr: From Political Rivalry to Fatal Duel
The Hamilton-Burr feud ended in the most dramatic way possible: a duel at Weehawken, New Jersey, on July 11, 1804, where Hamilton was mortally wounded and Burr destroyed his own political career.
Their rivalry had been building for years. Both were New York lawyers and politicians, but Hamilton consistently blocked Burr’s ambitions. When Burr ran for governor of New York in 1804, Hamilton campaigned against him with particular venom, calling Burr dangerous and untrustworthy at a dinner party. When Burr read accounts of Hamilton’s remarks in a newspaper, he demanded an apology. Hamilton refused to apologize or deny the comments, leading to the duel challenge.
What made this especially tragic was that Hamilton’s oldest son, Philip, had been killed in a duel three years earlier defending his father’s honor. Hamilton reportedly planned to withhold his fire, but he either intentionally shot into the air or missed. Burr’s shot struck Hamilton in the abdomen, and he died the next day. Burr was charged with murder in both New York and New Jersey and fled to the South. Though he later returned to complete his term as vice president, his political career was finished.
Adams vs. Hamilton: The Federalist Crack-Up
One of the most destructive feuds happened within the same party. John Adams and Alexander Hamilton were both Federalists, but their relationship became poisonous during Adams’s presidency (1797-1801).
Hamilton, though not in government, tried to control Adams’s cabinet from behind the scenes. When Adams pursued peace negotiations with France (the “Quasi-War” with France was raging), Hamilton wanted war. Adams discovered that several of his cabinet members were more loyal to Hamilton than to him and fired them. In the 1800 election, Hamilton wrote a fifty-four-page pamphlet attacking Adams’s character and fitness for office—extraordinary since they were in the same party. The pamphlet was meant for limited circulation among Federalist leaders, but Jefferson’s allies got hold of it and published it widely, devastating both Adams’s re-election chances and Hamilton’s reputation. The feud helped Jefferson win and essentially destroyed the Federalist Party.
Washington and Jefferson: The Unacknowledged Tension
While Washington and Jefferson never had an open feud, their relationship cooled significantly during Washington’s presidency. Jefferson, as Secretary of State, increasingly opposed the administration’s policies, particularly Hamilton’s financial program. When Washington supported the Jay Treaty with Britain in 1795—which Jefferson saw as a betrayal of France and Republican principles—Jefferson became convinced Washington had fallen under Hamilton’s spell.
Jefferson resigned from the cabinet in 1793, partly from policy disagreements but also from discomfort with what he saw as Washington’s monarchical tendencies (the formal receptions and the ceremonial aspects of the presidency). Washington, in turn, came to view Jefferson as disloyal, especially when he learned Jefferson had been secretly funding attacks on the administration in opposition newspapers and had even put a leading critic on the federal payroll. By the time Washington delivered his Farewell Address in 1796, warning against political parties and foreign entanglements, many saw it as a rebuke of Jefferson’s philosophy. They maintained outward courtesy, but their warm relationship never recovered.
Why These Feuds Mattered
These weren’t just personal squabbles—they shaped American democracy in profound ways. The Hamilton-Jefferson rivalry created our two-party system (despite Washington’s warnings). The Adams-Hamilton split showed that parties could fracture from within. The Adams-Jefferson reconciliation demonstrated that political enemies could find common ground after leaving power.
The founding fathers were human, with all the ambition, pride, jealousy, and pettiness that entails. They fought over power, principles, and personal slights. What’s remarkable isn’t that they agreed on everything—they clearly didn’t—but that despite their bitter divisions, they created a system robust enough to survive their feuds. The Constitution itself, with its checks and balances, almost seems designed to accommodate such disagreements, ensuring that no single person or faction could dominate.
SOURCES
https://founders.archives.gov
2. Massachusetts Historical Society – Adams-Jefferson Letters
https://www.masshist.org/publications/adams-jefferson
3. Founders Online – Hamilton’s Letter Concerning John Adams
https://founders.archives.gov/documents/Hamilton/01-25-02-0110
4. Gilder Lehrman Institute – Hamilton and Jefferson
https://www.gilderlehrman.org/history-resources/spotlight-primary-source/alexander-hamilton-and-thomas-jefferson
5. National Park Service – The Conway Cabal
https://www.nps.gov/articles/000/the-conway-cabal.htm
6. American Battlefield Trust – Hamilton-Burr Duel
https://www.battlefields.org/learn/articles/hamilton-burr-duel
7. Mount Vernon – Thomas Jefferson
https://www.mountvernon.org/library/digitalhistory/digital-encyclopedia/article/thomas-jefferson
8. Monticello – Thomas Jefferson Encyclopedia
https://www.monticello.org/research-education/thomas-jefferson-encyclopedia
9. Library of Congress – John Adams Papers
https://www.loc.gov/collections/john-adams-papers
10. Joseph Ellis – “Founding Brothers: The Revolutionary Generation”
https://www.pulitzer.org/winners/joseph-j-ellis
Illustration generated by author using ChatGPT.