Explain how the Scientific Revolution and Enlightenment ideas challenged religious authority, absolute rule and mercantilism

Learning goal: Explain how the Scientific Revolution impacted religious, political and cultural institutions by challenging how people viewed the world; explain how Enlightenment ideas regarding human nature and society challenged religious authority, absolute rule and mercantilism; and explain how Enlightenment ideas on the relationship of the individual and the government influenced the American and French Revolutions.

What changed in the Scientific Revolution. Between roughly the mid-1500s and the late 1600s, European thinkers changed both what they believed about nature and how they decided what to believe. Before, educated Europeans largely relied on authority: ancient writers such as Aristotle and Ptolemy, read alongside Church teaching, described an Earth-centered (geocentric) universe of perfect heavenly spheres. In 1543 Nicolaus Copernicus published On the Revolutions of the Heavenly Spheres, proposing a Sun-centered (heliocentric) system. Johannes Kepler showed that planets move in ellipses. From 1609–1610 Galileo Galilei used a telescope to observe the moons of Jupiter and the phases of Venus, evidence that did not fit the old model. In 1687 Isaac Newton's Principia explained the motion of planets and falling objects with the same laws of motion and universal gravitation. In medicine, Andreas Vesalius (1543) corrected ancient anatomy by dissection, and William Harvey (1628) described the circulation of the blood.

A new method. Francis Bacon argued for reasoning from careful observation and experiment, and René Descartes for systematic doubt and mathematical reasoning. Together these contributed to what we now call the scientific method: observe, form a hypothesis, test it by experiment, and accept conclusions only as far as evidence supports them. This is the deeper challenge: it placed evidence and reason alongside, and sometimes above, inherited authority as the way to know the world.

Impact on institutions. The Scientific Revolution impacted religious institutions because it challenged the Church's role as the authority on the natural world. The clearest case is Galileo: in 1633 the Roman Inquisition condemned him for defending heliocentrism in his Dialogue (1632), and he spent his remaining years under house arrest. Be careful with the misconception that science and religion were simply enemies: Copernicus was a church official, Kepler and Newton were deeply religious, and many scientists saw their work as revealing God's design. The conflict was over who had authority to interpret nature. It impacted political institutions because rulers founded and sponsored scientific societies (England's Royal Society was chartered in 1662 and France's Academy of Sciences founded in 1666), and because the idea that nature follows discoverable laws encouraged thinkers to look for natural laws of society and government. It impacted cultural institutions by spreading a habit of questioning through printed books, learned societies, correspondence networks, and later salons and coffeehouses.

The Enlightenment applies reason to society. In the 1700s Enlightenment thinkers applied the same reasoning to human nature and society. Their ideas challenged three pillars of the old order. Religious authority: Voltaire attacked religious intolerance and the persecution of dissenters; deists held that God created a universe run by natural law, and many thinkers called for religious toleration. Absolute rule: absolute monarchs such as France's Louis XIV claimed power by divine right. Thomas Hobbes (Leviathan, 1651) argued that people give up freedom to a strong ruler to escape a violent state of nature, a defense of strong authority but one based on a social contract, not divine right. John Locke, who also described the mind at birth as a tabula rasa (a blank slate shaped by experience, which made education central to reform), argued in Two Treatises of Government (1689) that people are born with natural rights to life, liberty and property, that government exists by the consent of the governed to protect those rights, and that people may replace a government that violates them. Montesquieu (The Spirit of the Laws, 1748) proposed separating legislative, executive and judicial powers so that each checks the others. Jean-Jacques Rousseau (The Social Contract, 1762) argued that legitimate authority comes from the general will of the people. Mercantilism: mercantilist governments sought national wealth through trade surpluses, colonies and heavy regulation. Adam Smith's The Wealth of Nations (1776) argued that wealth comes from productive labor and the division of labor, and that free markets guided by self-interest and competition generally serve society better than monopolies and trade restrictions, a hands-off approach to the economy known as laissez-faire.

Influence on the American and French Revolutions. Enlightenment ideas on the relationship of the individual and the government gave revolutionaries a language of rights. The American Declaration of Independence (1776) states that governments derive their just powers from the consent of the governed and that people may alter or abolish a destructive government, closely following Locke. The U.S. Constitution (1787) built in Montesquieu's separation of powers. In France, the Estates-General met in May 1789, the National Assembly formed in June, and on 26 August 1789 the Assembly adopted the Declaration of the Rights of Man and of the Citizen, which declared that men are born free and equal in rights and placed sovereignty in the nation, echoing Locke and Rousseau. Its Article 10 reflects the religious toleration Voltaire had campaigned for: "No one shall be disquieted on account of his opinions, including his religious views, provided their manifestation does not disturb the public order established by law."

Worked model of the influence claim. To show influence, a historian needs more than resemblance. Evidence: Jefferson had read Locke; the Declaration's wording closely parallels Locke's argument; delegates in France read Rousseau and knew the American documents. Qualification: revolutionaries also had immediate grievances (taxes, debt, bread prices in France), so ideas explain the justification and goals more than the timing. Ideas and grievances worked together.

Worked source question: Why did the Church condemn Galileo but not immediately condemn Copernicus's 1543 book? Solution: Copernicus's book was long read as a mathematical tool for calculation, and its preface presented the system as a hypothesis. Galileo argued that heliocentrism was physically true and wrote in Italian for a wider audience, directly challenging the Church's authority to interpret nature and Scripture. The Dialogue was condemned in 1633. The difference is about authority and audience, not simply about the astronomy.

Worked comparison of thinkers: Hobbes and Locke both used a social contract. Hobbes concluded that people should obey a strong sovereign to avoid chaos; Locke concluded that government is limited to protecting natural rights and may be replaced if it violates them. Both challenged divine right because both grounded authority in human agreement; only Locke's version justified revolution, which is why American and French revolutionaries drew on him rather than on Hobbes.

Worked economics example: A mercantilist kingdom bans its colonies from buying cloth from any other country and taxes imported goods heavily to keep gold at home. Smith's critique: colonists pay higher prices, protected producers have less reason to improve, and national wealth is really the goods and services people can produce and buy, not the stock of gold. The example shows how an Enlightenment idea challenged mercantilism with reasoning about human nature (self-interest) and society (the division of labor).

Ideas-to-documents chart: Build a table with rows for Locke, Montesquieu, Rousseau, Voltaire and Smith. Columns: key idea in one sentence; which part of the old order it challenged (religious authority, absolute rule or mercantilism); a phrase or principle from the Declaration of Independence, the U.S. Constitution or the Declaration of the Rights of Man that reflects it, or "no direct connection" if you cannot find one (Smith's influence was mainly on economic policy); and one limit of that influence.

Independent performance: Write a 350-word explanation answering "How did a change in how people viewed the natural world lead to a change in how they viewed government?" Success criteria: at least two scientific examples with dates (for example Copernicus 1543, Galileo 1633, Newton 1687); an explanation of the shift from authority to evidence and reason; at least two Enlightenment thinkers linked to a challenge to religious authority, absolute rule or mercantilism; one specific connection to the American and one to the French Revolution; and a sentence noting that grievances as well as ideas caused the revolutions.