AP World History Modern Review Guide: All 9 Units Explained

AP World History Modern covers the world from 1200 to the present. That is 800 years of interconnected history on every continent. The exam is less interested in trivia than in your ability to compare across regions, trace change and continuity over time, and explain cause and effect. If you learn the structure (units, themes, regions), the content fits into it.

This guide walks through all 9 units, the six themes, the comparison framework, and the rubrics for the DBQ and LEQ. Do not memorize every fact. Understand the patterns, and the facts hang on them.

What the exam looks like

Exam structure and scoring

• 3 hours 15 minutes. Same format as APUSH.
• Section I Part A: 55 multiple choice in 55 minutes (40 percent).
• Section I Part B: 3 Short Answer Questions (SAQs) in 40 minutes (20 percent).
• Section II Part A: Document-Based Question (DBQ) in 60 minutes, 7 documents (25 percent). Always on the period 1450-2001.
• Section II Part B: Long Essay Question (LEQ), choice of 3 prompts across different periods, 40 minutes (15 percent).

The six themes

Every prompt ties to one or more of these themes. Use them as your lens:

• Governance (GOV): how states formed, consolidated, and collapsed. Political structures.
• Cultural Developments and Interactions (CDI): religion, philosophy, art, science, their spread and syntheses.
• Technology and Innovation (TEC): tools, ideas, techniques that transformed societies.
• Economic Systems (ECN): production, trade, labor systems (slavery, feudalism, wage labor), economic philosophies.
• Social Interactions and Organization (SIO): gender, class, race, ethnicity, family structures.
• Humans and the Environment (ENV): how societies shaped and were shaped by their environments.

Unit 1: The Global Tapestry (c. 1200-1450)

State building across regions

• East Asia: Song China (civil service exams, Neo-Confucianism, technological innovations like gunpowder and movable type, foot binding). Later Yuan (Mongol) and Ming.
• Dar al-Islam: Abbasid Caliphate fragmentation, Seljuk Turks, Mamluk Sultanate in Egypt, Delhi Sultanate in India. Cultural flowering: House of Wisdom, Islamic scholarship, trade networks.
• South and Southeast Asia: Delhi Sultanate (Muslim rule over Hindu majority), Vijayanagara, Majapahit, Khmer Empire.
• Sub-Saharan Africa: Mali Empire (Mansa Musa, trans-Saharan gold trade, Timbuktu), Great Zimbabwe, Swahili city-states (Indian Ocean trade).
• Americas: Aztec Empire (Tenochtitlan, tribute system, human sacrifice), Inca Empire (Andean terraces, mit'a labor, Machu Picchu).
• Europe: feudalism, manorialism, Christian Church, Holy Roman Empire, rise of towns, universities, Black Death (1347-51) transforming society.
• Key idea: by 1450, every region had complex states with distinct religious, political, and economic systems.

Unit 2: Networks of Exchange (c. 1200-1450)

Trade routes and cultural diffusion

• Silk Roads: connected China, Central Asia, Middle East, Europe. Silk, porcelain, spices. Cultural exchange: Buddhism spread to China.
• Indian Ocean trade: monsoon winds, Arab dhows, Chinese junks. Spices, textiles, slaves. Swahili coast, Malacca, Calicut as key ports.
• Trans-Saharan trade: camels, salt for gold. Mansa Musa's hajj displayed Mali's wealth.
• Mongol Empire (13th-14th c.): largest contiguous empire in history. Pax Mongolica enabled Silk Road trade. Also spread Black Death.
• Travelers: Marco Polo (Italian to China), Ibn Battuta (Moroccan across Dar al-Islam), Mansa Musa (Mali to Mecca).
• Technologies diffused: gunpowder, compass, paper (from China westward). Bubonic plague moved east to west.
• Key idea: pre-modern world was not isolated. Networks of exchange moved goods, people, ideas, and diseases across vast distances.

Unit 3: Land-Based Empires (c. 1450-1750)

Gunpowder empires

• Ottoman Empire: expanded from Anatolia. Captured Constantinople (1453). Peak under Suleiman the Magnificent. Devshirme (Christian boys taken as Janissaries). Sunni Islam.
• Safavid Empire (Persia): founded by Ismail. Shia Islam (distinguished from Sunni Ottomans). Frequent wars with Ottomans.
• Mughal Empire (India): founded by Babur. Akbar the Great ruled with religious tolerance. Shah Jahan built Taj Mahal. Aurangzeb's intolerance accelerated decline.
• Ming and Qing China: Ming (1368-1644, restoration of Han rule, Great Wall expansion, Zheng He voyages then isolation). Qing (1644-1912, Manchu dynasty).
• Russia: Ivan IV 'the Terrible', expansion into Siberia. Peter the Great westernized. Romanov dynasty.
• Methods of legitimation: religion (Islam, Neo-Confucianism, divine right), art and architecture (Hagia Sophia conversion, Taj Mahal, Versailles), bureaucracy, tax collection.
• Key idea: gunpowder enabled centralized empires that consolidated territory and used religion to legitimize rule.

Unit 4: Transoceanic Interconnections (c. 1450-1750)

European expansion and global trade

• Technological advances: caravel ships, lateen sails, astrolabe, compass, magnetic compass, cartography.
• Portuguese and Spanish expansion: Prince Henry, Vasco da Gama (to India), Columbus (1492), Magellan (circumnavigation).
• Columbian Exchange: plants (maize, potatoes to Old World; wheat, sugar to New World), animals (horses to Americas), diseases (smallpox devastated Native populations), people (forced and voluntary migration).
• Atlantic slave trade: ~12 million Africans forcibly transported to Americas over 400 years. Triangular trade (slaves, sugar/tobacco, manufactured goods).
• Spanish colonial system: encomienda (Native labor), mit'a (Inca-style corvee labor), hacienda (large estates), casta system (racial hierarchy).
• Joint-stock companies: British East India Company, Dutch East India Company (VOC) pioneered investment in risky voyages.
• Mercantilism: nation's wealth = total gold and silver. Accumulate trade surplus, extract from colonies.
• Silver trade: Spanish silver from Potosi (Bolivia) flowed to China via Manila galleons, globalizing the economy.
• Key idea: for the first time, the world was truly connected in a global economic system built on European maritime power and African slavery.

Unit 5: Revolutions (c. 1750-1900)

Enlightenment and Atlantic revolutions

• Enlightenment: reason, natural rights, social contract. Locke, Rousseau, Voltaire, Smith. Influenced revolutions.
• American Revolution (1776): Declaration of Independence, Constitution, Bill of Rights. Influenced others.
• French Revolution (1789): Estates-General, Storming of Bastille, Declaration of Rights of Man, Reign of Terror, Napoleon.
• Haitian Revolution (1791-1804): only successful slave revolt. Toussaint L'Ouverture. Founded first black republic.
• Latin American independence: Bolivar (Gran Colombia), San Martin (Argentina, Chile, Peru). Creoles led movements.
• Industrial Revolution: started in Britain. Textile factories, steam engine, railroads, telegraph. Spread to US, Germany, Japan.
• Social consequences: working class emerged, urbanization, pollution, child labor. Labor movements, unions, socialism (Marx).
• Nationalism and unification: Italy (Cavour, Garibaldi), Germany (Bismarck, Franco-Prussian War).
• Reform movements: abolitionism (slavery ended: Britain 1833, US 1865, Brazil 1888), women's rights (Seneca Falls 1848), suffragettes.
• Key idea: Enlightenment ideas and industrialization transformed political and economic systems worldwide.

Unit 6: Consequences of Industrialization (c. 1750-1900)

New imperialism

• Motives: economic (raw materials, markets, investment), political (nationalism, strategic), ideological (social Darwinism, 'White Man's Burden,' civilizing mission).
• Scramble for Africa: Berlin Conference (1884-85) partitioned Africa without Africans. By 1914, only Ethiopia and Liberia remained independent.
• Asia: British Raj (India), French Indochina, Dutch East Indies, Opium Wars (Britain vs Qing China), unequal treaties, spheres of influence.
• Resistance: Sepoy Rebellion (India 1857), Boxer Rebellion (China 1900), Zulu resistance, Ethiopia defeated Italy at Adwa (1896).
• Economic imperialism in Latin America: formal independence but economic dependence on US and Europe (banana republics, export economies).
• Effects: forced labor, famines (Irish Potato Famine, Indian famines), racial hierarchies, environmental damage, loss of local industries.
• Global migrations: indentured servants (Indian to Caribbean, Chinese to California), economic migrants, Irish and European immigrants to Americas.
• Key idea: industrialized nations extracted resources and markets from non-industrialized world, sometimes through direct colonization, sometimes economically.

Unit 7: Global Conflict (c. 1900-Present)

World Wars

• WWI (1914-18): causes (militarism, alliances, imperialism, nationalism; spark was assassination of Archduke). Trench warfare, machine guns, poison gas, ~20 million dead.
• Treaty of Versailles (1919): harsh on Germany (war guilt clause, reparations), redrew maps of Europe and Middle East (Sykes-Picot), collapsed Austro-Hungarian, Ottoman, Russian, German empires. League of Nations.
• Russian Revolution (1917): Bolsheviks (Lenin) overthrew Tsar and then Provisional Government. Founded first communist state (USSR). Stalin's totalitarian rule, Five-Year Plans, Great Purge.
• Interwar: Great Depression (1929), rise of totalitarianism (Nazi Germany under Hitler, Fascist Italy under Mussolini, Imperial Japan).
• WWII (1939-45): Nazi invasion of Poland. Allies vs Axis. ~60 million dead. Holocaust (~6 million Jews). Atomic bombs on Hiroshima and Nagasaki ended war.
• Decolonization begins: India (1947, Gandhi's nonviolence), Israel (1948), split of Indochina, Algeria (1962 after violent war with France).
• Key idea: total war reshaped states, economies, and populations on an unprecedented scale. Empires collapsed.

Unit 8: Cold War and Decolonization (c. 1900-Present)

Post-war world

• Cold War (1947-1991): US (capitalism, democracy) vs USSR (communism, single-party state). NATO vs Warsaw Pact. Nuclear arms race.
• Proxy wars: Korean War (1950-53), Vietnam War (US failed 1975), Cuban Revolution (Castro 1959) and Missile Crisis (1962), Afghanistan (USSR invasion 1979), Latin America (US-backed coups).
• Non-Aligned Movement: India (Nehru), Egypt (Nasser), Indonesia (Sukarno), Yugoslavia (Tito). Refused to pick sides.
• Chinese Revolution (1949): Mao's communists defeated Nationalists (Chiang Kai-shek). Great Leap Forward (famine), Cultural Revolution (purge of intellectuals).
• Decolonization: Ghana (1957), Kenya (Mau Mau), Algeria, Indonesia, Vietnam. Varied paths (nonviolent vs armed struggle).
• Apartheid in South Africa: formal racial segregation (1948-1994). Mandela, ANC. International sanctions.
• End of Cold War: Gorbachev's perestroika and glasnost, fall of Berlin Wall (1989), collapse of USSR (1991).
• Key idea: two superpowers defined the post-1945 world while former colonies fought for independence.

Unit 9: Globalization (c. 1900-Present)

Interconnected modern world

• Economic globalization: free trade agreements (NAFTA, EU, WTO), multinational corporations, supply chains across countries, neoliberalism.
• Technological change: computers, internet, mobile phones. Information age transformed work and communication.
• Environmental consequences: climate change, deforestation, pollution. Kyoto Protocol, Paris Agreement. Debate over responsibility (developed vs developing).
• Migration: labor migration, refugees (from wars and climate change), brain drain.
• Terrorism: 9/11 (2001), War on Terror, rise of ISIS.
• Pandemics: HIV/AIDS, SARS, Ebola, COVID-19 (2020-). Showed interconnectedness AND fragility.
• Human rights: UN Universal Declaration (1948), women's rights, LGBTQ rights, indigenous movements.
• Key idea: interconnection accelerated, along with its benefits (trade, prosperity) and costs (inequality, climate change, pandemics).

Thinking across regions

World History rewards comparison. Practice comparing similar phenomena in different regions:

• Responses to European expansion: Tokugawa Japan (isolation) vs Ming/Qing China (limited trade) vs Mughal India (welcomed trade, conquered).
• Responses to industrialization: Japan (Meiji modernized quickly) vs China (conservative, fell behind) vs Ottoman Empire (Tanzimat reforms, limited success).
• Decolonization paths: India (Gandhi, nonviolent) vs Algeria (violent war) vs Ghana (negotiated).
• Revolutions: American (moderate, preserved wealth) vs French (radical, violence) vs Russian (complete overthrow of old order) vs Chinese (peasant-based).

DBQ document types

• Travel accounts: Ibn Battuta, Marco Polo, missionaries. Useful for showing contact between cultures.
• Religious texts and sermons: reveal beliefs, social norms, legitimation of authority.
• Revolutionary manifestos: Declaration of Rights of Man, Bolivar, Communist Manifesto.
• Economic data: trade volumes, GDP, industrial output. Always ask: who collected this data and why?
• Photographs and political cartoons: propaganda, power, perspective.
• Government decrees and treaties: formal policies and international agreements.
• Autobiographies and diaries: personal experience, subject to bias.

DBQ and LEQ rubrics

Same rubrics as APUSH: DBQ is 7 points (thesis, contextualization, evidence from docs, outside evidence, HIPP analysis, complexity). LEQ is 6 points (thesis, contextualization, evidence, reasoning with complexity).

How to score a 5 on AP World History

1. Learn the regions. Do not bury your head in one (like Europe). World History is GLOBAL. Know major developments in East Asia, South Asia, Middle East, Africa, Europe, Americas.
2. Master the six themes. Use them in every essay to categorize and compare developments.
3. Practice chronology. Know roughly when key events happened so you can correctly situate developments in time.
4. Learn cross-regional comparisons. This is what the LEQ tests most often. Have 5-10 ready for common comparisons (responses to imperialism, paths of decolonization, types of revolutions).
5. Practice the DBQ essay under timed conditions. The 15-minute reading window is crucial. Use it to identify the prompt's stakes, skim all 7 docs, and plan your thesis.
6. Plan for complexity on every essay. Compare across periods, show change AND continuity, offer counterarguments.

Common mistakes

• Spending too much time on any one region (usually Europe). World History is global. Balance your knowledge.
• Treating the 20th century like a bonus unit. Three of the nine units cover 1900-present. Know it well.
• Forgetting HIPP analysis on the DBQ. Every DBQ needs it for at least 3 documents.
• Writing generic thesis statements. 'Many things changed' is NOT a thesis. Specify regions, time periods, and your line of reasoning.
• Confusing decolonization paths. Nonviolent (India), negotiated (Ghana), and violent (Algeria) are NOT the same story.
• Equating 'globalization' with modern. The world was globalizing since at least 1450. Don't restrict it to post-1945.
• Missing causation in favor of description. The LEQ often asks WHY something happened, not what happened. Give reasons, not just events.

The world was connected long before globalization. Learn the connections, apply the themes, compare across regions, and the content organizes itself.