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Reading Time: 7 min
Last Updated: August 20, 2026
Main Ideas: 5
Reading Time: 7 min
Last Updated: August 20, 2026
Main Ideas: 5

Topic 5.1 Notes – The Enlightenment

Verified for 2027 AP® World History: Modern Exam
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The Enlightenment was a late 1600s to 1700s movement that used reason and observation to rethink government, society, and religion. It matters in AP World because it gave people a new language for challenging power, and that language shows up in Atlantic revolutions and later reform movements.

What Enlightenment Thought Was

The Enlightenment grew out of the Scientific Revolution. Europeans had seen that natural laws could be discovered through observation and reason, so thinkers started asking whether governments and social systems could be judged the same way.

  • Reason meant people could question old institutions instead of accepting them because kings, churches, or tradition said so.
  • Empiricism meant knowledge should come from observation and experience, not just inherited authority.
  • This opened criticism of absolute monarchy, hereditary privilege, censorship, torture, slavery, serfdom, and patriarchy.

John Locke’s tabula rasa idea said the mind begins as a “blank slate.” Experience shapes people. That challenged the idea that hierarchy was naturally fixed at birth.

Study guide illustration

Portrait of John Locke

One AP trap here is cause. Enlightenment ideas helped inspire revolutions, but they were not the only cause. Debt, war, inequality, and local conflicts mattered too.

Core Enlightenment Ideas About Government and Rights

These ideas keep showing up in documents and sources, so know the whole set: natural rights, social contract, consent of the governed, popular sovereignty, separation of powers, religious toleration, legal reform.

Natural rights

Locke argued that people have natural rights to life, liberty, and property. These rights come from nature, not from rulers. Government exists to protect them. If it fails, it loses legitimacy. That directly challenged divine-right monarchy.

Social contract and consent of the governed

Different thinkers agreed that government is a human creation, not a sacred family inheritance.

ThinkerMain idea
HobbesPeople create government to escape chaos, so he supported strong authority.
LockeGovernment is a contract to protect rights, and people may resist tyranny.
RousseauSovereignty belongs to the people, and government should express the general will.

The shared point is consent. Rulers govern because people authorize them, not because of birth.

Limiting power

Montesquieu argued for separation of powers and checks and balances so no one part of government could become tyrannical.

Beccaria applied reason to law. He attacked torture and arbitrary punishment and supported due process and rational legal systems.

Religion and public life

The Enlightenment did not mean everyone became anti-religious.

  • Deism held that a creator exists, but reason matters more than church authority or revelation.
  • Voltaire pushed for religious toleration, freedom of thought, and less censorship.
  • The long-term effect was secularization. Governments became less controlled by churches.

How Enlightenment Ideas Spread and Were Used

Ideas spread because print spread.

  • Books, pamphlets, newspapers, essays, political writing
  • Diderot’s Encyclopédie organized knowledge and spread criticism of superstition and privilege
  • Salons, coffeehouses, academies, clubs, Masonic lodges created a public sphere for debate

Salons often depended on elite women as hosts. Women still lacked equality, but they shaped discussion spaces before they gained political rights.

Diffusion meant adaptation. People used Enlightenment language for their own struggles:

  1. Enlightenment ideas set standards for legitimate government.
  2. People judged abuses as rights violations.
  3. Grievances turned into political claims.
  4. Revolutions and constitutions used Enlightenment language.

Recognize these examples for the next topic: Declaration of Independence, Declaration of the Rights of Man and of the Citizen, Bolívar’s Letter from Jamaica.

Reform from Above and Reform Over Time

Some monarchs borrowed Enlightenment ideas without giving up power. That is enlightened absolutism.

  • Frederick II of Prussia used administrative reform and limited toleration.
  • Catherine II of Russia liked Enlightenment ideas in theory but preserved noble privilege and expanded serfdom.
  • Joseph II of Austria supported religious toleration and tried to reduce serf obligations.

Catherine the Great is a good example of that mix of reform language and strong royal power.

Study guide illustration

Catherine II of Russia

The limit was simple. Rulers protected their own authority.

Enlightenment ideas also fed later reforms, often mixed with religious activism:

  • Expanded suffrage widened participation beyond propertied men.
  • Abolition of slavery
    • Britain ended the slave trade in 1807
    • Britain abolished slavery in most of its empire in 1833
  • End of serfdom
    • Joseph II pushed reforms in Habsburg lands
    • Russia emancipated serfs in 1861

Women’s Rights, Nationalism, and the Limits of the Enlightenment

Women’s-rights thinkers pointed out the contradiction in “universal rights.”

  • Olympe de Gouges, Declaration of the Rights of Woman (1791)
  • Mary Wollstonecraft, A Vindication of the Rights of Woman (1792). Her main claim was that women are rational, and inequality comes from poor education, not natural inferiority.
  • Seneca Falls Convention (1848), led by Elizabeth Cady Stanton and Lucretia Mott, demanded equality and suffrage.

Nationalism was related but different. Enlightenment thought centered on individuals and legitimate government. Nationalism centered on a people with a shared identity seeking self-rule. Both challenged dynasties and empires, but nationalism could exclude minorities. Its full development belongs more to Topic 5.2.

Key Takeaways

Enlightenment thinkers judged government by whether it protected rights, not by whether it was old, royal, or religiously approved.
Locke is the key thinker for AP World because his natural rights and right of resistance show up all over Atlantic revolutions.
Hobbes, Locke, and Rousseau all used social contract language, but they did not mean the same kind of government.
Enlightenment ideas explain the ideology behind revolutions, not the entire cause of revolutions.
Enlightened absolutists reformed from above without accepting popular sovereignty.
Women, enslaved people, and colonial subjects used Enlightenment language to expose the limits of “universal” rights.
Nationalism overlaps with Enlightenment ideas about self-rule, but it is a distinct ideology built around shared identity.

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Notes

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