Master AP® World History: Modern from first principles
Free background-reading lessons for world history — concept and vocabulary support, not a graded question bank. Independently authored AP® World History content; not affiliated with the College Board.
AP World History: Modern — What the Course Covers
A map of all nine AP World History: Modern units, their time periods, and which four carry the most exam weight.
Unit 1.1 — East Asia, c. 1200–1450
Topic 1.1: Song China's economic/tech peak, the Mongol Yuan Dynasty, the Ming restoration, Japan's Kamakura shogunate, and Goryeo Korea — c. 1200–1450.
Unit 1.2 — Dar al-Islam, c. 1200–1450
Topic 1.2: the Abbasid collapse, Seljuk/Mamluk/Delhi successor states, and the three ways Islam spread — trade, Sufism, and conquest — c. 1200–1450.
Unit 1.3 — South and Southeast Asia, c. 1200–1450
Topic 1.3: the Delhi Sultanate and Vijayanagara in South Asia, the Khmer Empire and Majapahit in Southeast Asia, and how trade — not conquest — spread Islam through the maritime world.
Unit 1.4 — The Americas, c. 1200–1450
Topic 1.4: the Aztec tribute empire and chinampas, the Inca's road/mit'a/quipu administrative state, and Cahokia — three American state-building models, developed with zero Afro-Eurasian contact.
Unit 1.5 — Africa, c. 1200–1450
Topic 1.5: Mali's gold-and-salt trade and Mansa Musa's famous hajj, Great Zimbabwe's gold-and-cattle economy, the independent Swahili coast city-states, and Christian Ethiopia's ties to Dar al-Islam.
Unit 1.6 — Europe, c. 1200–1450
Topic 1.6: European feudalism as decentralized power, the Catholic Church as Western Europe's real unifying institution, and how Byzantine/Orthodox Christianity ran on a very different Church-state model.
Unit 2.1 — The Silk Roads
Topic 2.1: the Silk Roads' geography (Kashgar, Samarkand), the goods that moved on them, caravanserai infrastructure, and how Buddhism and Islam spread along the same routes as silk and spices.
Unit 2.2 — The Mongol Empire and the Making of the Modern World
Topic 2.2: how a century of unified Mongol control (the Pax Mongolica) made Silk Road trade safer, what administrative tools (standardized currency, the yam relay system) made that possible, and why religious tolerance was practical governance strategy.
Unit 2.3 — Exchange in the Indian Ocean
Topic 2.3: how monsoon winds made Indian Ocean voyages predictable, the dhows/junks/compass/astrolabe that made the trade possible, port cities like Calicut and Malacca, and Zheng He's state-sponsored voyages.
Unit 2.4 — Trans-Saharan Trade Routes
Topic 2.4: the gold-for-salt exchange, how the camel and camel saddle made desert crossing possible, Timbuktu's growth from caravan stop to Islamic learning center, and how trade (not conquest) spread Islam into West Africa.
Unit 2.5 — Cultural Consequences of Connectivity
Topic 2.5: Marco Polo's journey to the Mongol court and Ibn Battuta's decades-long travels across Dar al-Islam, plus how technology (gunpowder, paper) and architecture spread along the same trade networks.
Unit 2.6 — Environmental Consequences of Connectivity
Topic 2.6: the Black Death spread along the same Mongol-secured trade routes that carried culture in Topic 2.5, killing an estimated 75–200 million people and weakening serfdom through labor shortages.
Unit 2.7 — Comparison of Economic Exchange
Topic 2.7 closes Unit 2 by comparing the Silk Roads, Indian Ocean, and trans-Saharan networks: shared causes and trading-city hubs, but different geography, cargo (bulk vs. luxury), and political dependence (Mongol stability vs. merchant independence).
Unit 3.1 — Empires Expand
Topic 3.1 opens Unit 3: the Ottoman, Safavid, Mughal, and Qing empires expanded c. 1450–1750 using gunpowder weapons, bureaucracy, and religious justification — with real rivalries like Safavid-Mughal and Morocco's 1591 defeat of Songhai.
Unit 3.2 — Empires: Administration
Topic 3.2: how gunpowder empires actually governed — Ottoman devshirme/Janissaries and the millet system, the Mughal mansabdar rank-for-service system, and Songhai's use of Islam as an administrative tool.
Unit 3.3 — Empires: Belief Systems
Topic 3.3: how gunpowder empires used religion to justify rule — the Sunni Ottoman vs. Shi'a Safavid rivalry (Battle of Chaldiran, 1514), Mughal religious pluralism, and Qing emperors performing Neo-Confucian legitimacy as ethnic outsiders.
Unit 3.4 — Comparison in Land-Based Empires
Topic 3.4 closes Unit 3 by comparing the Ottoman, Safavid, Mughal, Qing, and Russian empires across shared categories — military technology, trade wealth, bureaucracy, and religious legitimacy — while highlighting sharp differences like Sunni-Shi'a rivalry and theocratic vs. pluralist governance.
Unit 4.1 — Technological Innovations
Topic 4.1 opens Unit 4: the caravel, carrack, and fluyt, plus the compass (Chinese origin) and astrolabe (Islamic origin), refined by Portuguese and other European sailors into the toolkit that made transoceanic travel possible.
Unit 4.2 — Exploration: Causes and Events
Topic 4.2: the God/Gold/Glory motives behind European exploration, Prince Henry's Sagres navigation school, and the key voyages (Dias 1488, Columbus 1492, da Gama 1498, Magellan 1519–1522) that connected the hemispheres.
Unit 4.3 — The Columbian Exchange
Topic 4.3: the Columbian Exchange moved crops (potatoes, maize) from the Americas to the Old World and animals plus catastrophic disease the other way, killing an estimated 50–90% of the pre-Columbian Indigenous population within a century.
Unit 4.4 — Maritime Empires Established
Topic 4.4: Portugal built a trading-post empire (fortified coastal ports, armed carracks) while Spain pursued territorial conquest (viceroys, audiencias) using coerced labor systems — encomienda, chattel slavery, and the adapted Incan mit'a.
Unit 4.5 — Maritime Empires Maintained and Developed
Topic 4.5: mercantilism (bullion accumulation, favorable trade balance) as the economic logic of empire, and the joint-stock company — especially the Dutch East India Company (VOC), chartered 1602 with state-like powers — as the financial engine that sustained it.
Unit 4.6 — Internal and External Challenges to State Power
Topic 4.6: internal challenges (the Fronde 1648–53, Cossack/Stenka Razin uprisings) versus external challenges (Pueblo Revolt 1680, Metacom's War, Maratha-Mughal conflict, Ana Nzinga, Maroon communities) to centralizing state power — with dates, causes, and outcomes for essay evidence.
Unit 4.7 — Changing Social Hierarchies
Topic 4.7: the transatlantic slave trade (triangular trade, Middle Passage) created chattel slavery — a hereditary, racialized legal category — and enslaved people resisted at every scale, from shipboard revolts to Maroon communities to the successful Haitian Revolution (1791–1804).
Unit 4.8 — Continuity and Change from 1450 to 1750
Topic 4.8 closes Unit 4 with the CCOT essay skill: transoceanic connections, maritime empires, and racialized slavery genuinely changed the world 1450–1750, while patriarchy, agriculture, religious legitimacy, and older overland trade routes persisted — and land-based empires never actually disappeared.
Unit 5.1 — The Enlightenment
Topic 5.1 opens Unit 5: Locke's natural rights, Rousseau's social contract, Montesquieu's separation of powers, Voltaire's deism, Adam Smith's markets, and Wollstonecraft's internal critique — the exact vocabulary every Atlantic revolution in Topic 5.2 will use.
Unit 5.2 — Nationalism and Revolutions
Topic 5.2: nationalism plus Enlightenment natural rights triggered four dated Atlantic revolutions — American (1775–83), French (1789–99, Louis XVI executed 1793), Haitian (1791–1804, Toussaint Louverture), and Latin American independence (from 1808, Simón Bolívar).
Unit 5.3 — Industrialization Begins
Topic 5.3: why industrialization began in Britain — coal/iron geography, colonial capital, labor economics, enclosure-driven urban workforce, and stable transport — plus the specific inventions (spinning jenny, water frame, power loom, Watt's steam engine) that mechanized textiles first.
Unit 5.4 — Industrialization Spreads
Topic 5.4: industrialization spread from Britain to Belgium (1800s), Germany (unified 1871, investment banks), the US (immigration-fed labor), Russia (state-directed, Trans-Siberian Railroad), and Japan (Meiji era 1868–1900, defensive state-led modernization).
Unit 5.5 — Technology in the Industrial Age
Topic 5.5: the Bessemer process (1856, cheap steel), the telegraph (transatlantic cable 1866), railroads, steamships plus the Suez Canal (1869), and the internal combustion engine — the technological engine behind Unit 6's New Imperialism.
Unit 5.6 — Government's Role in Industrialization
Topic 5.6: protectionist tariffs (the infant industry argument), Germany's 1834 Zollverein customs union, Meiji Japan's build-then-sell-to-zaibatsu pattern, and Sergei Witte's Russian package (Trans-Siberian Railroad, gold standard, tariffs, indirect taxation).
Unit 5.7 — Economic Developments and Innovations
Topic 5.7: the shift from mercantilism to Adam Smith's laissez-faire and division of labor, plus the financial tools that made global-scale capitalism possible — limited liability corporations, stock markets, transnational firms like Unilever, and the gold standard.
Unit 5.8 — Reactions to Industrialization
Topic 5.8: a spectrum of responses to industrial capitalism — the Luddites (1811–16, localized machine-breaking), utopian socialists Saint-Simon/Fourier/Owen (model communities), labor unions (reform within the system), and Marx and Engels's 1848 Communist Manifesto (revolutionary theory).
Unit 5.9 — Social Effects of Industrialization
Topic 5.9: industrialization created a new working/middle/super-wealthy class structure, drove urbanization with severe living conditions, split gender roles sharply by class (factory labor vs. the 'cult of domesticity'), relied on child labor, and restructured family life around factory schedules.
Unit 5.10 — Continuity and Change in the Industrial Age
Topic 5.10 closes Unit 5 with the CCOT skill: industrial capitalism, new technology, new ideologies, and new nation-states genuinely transformed 1750–1900, while patriarchy, colonialism, class/racial hierarchy, and rural life for most of the world persisted.
Unit 6.1 — Rationales for Imperialism
Topic 6.1 opens Unit 6: Social Darwinism's pseudo-scientific racial hierarchy, the civilizing mission (Kipling's 1899 'White Man's Burden'), nationalism as competitive prestige, and religious conversion — four reinforcing justifications for late-19th-century imperial expansion.
Unit 6.2 — State Expansion, 1750–1900
Topic 6.2: how imperial expansion actually worked — quinine and modern weapons enabling the Scramble for Africa and the 1884–85 Berlin Conference, company rule converting to direct control (British Raj after 1857), US settler colonialism, and Meiji Japan/Russia expanding via the same industrial toolkit.
Unit 6.3 — Indigenous Responses to Imperialism
Topic 6.3: three types of response to imperial expansion — direct military resistance (Zulu defeat at Isandlwana's aftermath vs. Ethiopia's 1896 victory at Adwa), new state formation (Sokoto Caliphate, Cherokee Nation), and religious movements (Ghost Dance, Xhosa cattle-killing, Mahdist Wars), plus the hybrid Boxer Rebellion.
Unit 6.4 — Global Economic Development
Topic 6.4: export economies — Egyptian cotton, Amazon/Congo rubber (including Leopold II's brutal quota system), Peruvian guano, West African palm oil, Argentine refrigerated meat — supplying industrial demand from Unit 5, run on indentured labor after abolition.
Unit 6.5 — Economic Imperialism
Topic 6.5: economic imperialism without direct colonization — China's unequal treaties (Nanjing 1842, extraterritoriality, spheres of influence), the US Open Door Policy (1899–1900), and Latin America's debt-driven 'informal empire' under British loans.
Unit 6.6 — Causes of Migration, 1750–1900
Topic 6.6: push/pull factors, Europe's population doubling to 400 million by 1900, industrialization's dual pull (cities and colonies), the free-to-coerced spectrum (voluntary migrants, Chinese/Indian indentured servitude, convict labor), and steamships/railroads enabling circular migration.
Unit 6.7 — Effects of Migration, 1750–1900
Topic 6.7: migration's effects — ethnic enclaves like Chinatowns and Buenos Aires's Italian neighborhoods shaping receiving societies, situational gender-role shifts in sending societies, and restrictive backlash laws (US Chinese Exclusion Act 1882, Australia's White Australia Policy) rooted in Topic 6.1's racial ideology.
Unit 6.8 — Causation in the Imperial Age
Topic 6.8 closes Unit 6 with the causation essay skill: the Cause+Context+Evidence+Reasoning+Significance structure, worked through British India, the Scramble for Africa, and informal imperialism in China — weighing which causes and effects mattered most rather than just listing them.
Unit 7.1 — Shifting Power After 1900
Topic 7.1 opens Unit 7: the Ottoman Empire weakened by nationalism and the 1912–13 Balkan Wars, the Qing Dynasty's 1911 collapse (Sun Yat-sen, ending 2,000 years of imperial rule), and Japan's 1905 victory over Russia signaling a real shift in global power.
Unit 7.2 — Causes of World War I
Topic 7.2: the MAIN causes of WWI — militarism (Anglo-German arms race), alliances (Triple Entente vs. Triple Alliance), imperialism (colonial rivalry hardening blocs), nationalism (Balkan friction from Topic 7.1) — and the June 28, 1914 Sarajevo assassination that triggered them.
Unit 7.3 — Conducting World War I
Topic 7.3: trench warfare and no man's land on the Western Front, new lethal technology (machine guns, artillery, chlorine gas), total war mobilizing entire economies (women in factories, rationing, censorship), and colonial troops/labor recruited across the empires from Unit 6.
Unit 7.4 — Economy in the Interwar Period
Topic 7.4: Versailles reparations and the Dawes Plan's loan-dependent stabilization, Germany's 1923 hyperinflation, the 1929 stock market crash becoming a global Depression through interconnected trade, and two responses — FDR's New Deal vs. the Soviet Five-Year Plans.
Unit 7.5 — Unresolved Tensions After World War I
Topic 7.5: Wilson's Fourteen Points promised self-determination, but the peace conference applied it almost only to white Eastern Europe, imposing the League of Nations mandate system (Article 22's 'tutelage' language) on former Ottoman/German territories instead — fueling Pan-Arabism and nationalist movements like the Indian National Congress.
Unit 7.6 — Causes of World War II
Topic 7.6: Versailles resentment plus the Great Depression fueled fascism (Hitler, Mussolini); Germany's 1935 remilitarization and 1936 Rhineland occupation tested appeasement (Munich 1938); the Rome-Berlin Axis and Anti-Comintern Pact formed; Japan invaded Manchuria in 1931.
Unit 7.7 — Conducting World War II
Topic 7.7: Germany's blitzkrieg tactics, Pearl Harbor (Dec. 7, 1941) opening the Pacific theater, intensified total war and strategic bombing, D-Day (June 6, 1944) opening a second European front, and the atomic bombings of Hiroshima and Nagasaki (August 1945) ending the war.
Unit 7.8 — Mass Atrocities After 1900
Topic 7.8: mass atrocities driven by ideology and authoritarian power — the Armenian Genocide (1915), the Holocaust (the exam's central case, ~6 million Jews murdered), the Holodomor (1932–33), Cambodia under the Khmer Rouge (1975–79), and Rwanda (1994) and Bosnia (1992–95).
Unit 7.9 — Causation in Global Conflict
Topic 7.9 closes Unit 7 with the synthesis skill: sorting political vs. economic causes, ranking their relative significance, and tracing a single continuous causal chain from WWI's unresolved grievances through the interwar period to WWII rather than treating them as separate events.
Unit 8.1 — Setting the Stage for the Cold War and Decolonization
Topic 8.1 opens Unit 8: the Yalta (February 1945) and Potsdam (July 1945) conferences showing the wartime alliance already fracturing, the UN's 1945 founding as a League of Nations replacement, and the capitalism-vs-communism ideological axis that would structure the Cold War.
Unit 8.2 — The Cold War
Topic 8.2: containment doctrine (Truman Doctrine 1947), the Marshall Plan (1948, ~$13 billion), NATO (1949) vs. the Warsaw Pact (1955), and proxy wars like Korea (1950–53) — the mechanisms through which the US and USSR competed without ever fighting each other directly.
Unit 8.3 — Effects of the Cold War
Topic 8.3: the Cuban Missile Crisis (October 1962, 13 days) as the closest the Cold War came to direct war, Mutually Assured Destruction (MAD) as the strategy that prevented it, the Space Race (Sputnik 1957, Apollo 11 in 1969) as the arms race by another name, and the Non-Aligned Movement's refusal to pick a superpower bloc.
Unit 8.4 — Spread of Communism After 1900
Topic 8.4: communism spread through genuinely different local paths — Mao's peasant-based revolution in China (and the Great Leap Forward's famine), Ho Chi Minh's fusion of communism with anti-colonial war in Vietnam, Castro's revolution in Cuba, and Soviet-imposed satellite states in Eastern Europe.
Unit 8.5 — Decolonization After 1900
Topic 8.5: decolonization ran on a spectrum from violent (China, Algeria's FLN war from 1954, Vietnam) to nonviolent (India's Gandhi-led satyagraha and 1947 independence, marred by partition's violence; Ghana's 1957 negotiated independence under Nkrumah, the first in sub-Saharan Africa).
Unit 8.6 — Newly Independent States After 1900
Topic 8.6: newly independent states inherited artificial borders (Topic 6.2's Berlin Conference), economic dependency on extraction (Topic 6.4's export economies), institutions built for extraction rather than governance, and constrained sovereignty within Cold War bipolarity.
Unit 8.7 — Global Resistance to Established Order After 1900
Topic 8.7: resistance to entrenched power after 1900, spanning nonviolent civil disobedience (Gandhi's method transferred to MLK's civil rights movement, 1954–1963; Mandela's decades-long anti-apartheid struggle) to armed insurgency, and repressive regimes (Pinochet, Franco, Amin) that escalated rather than resolved it.
Unit 8.8 — End of the Cold War
Topic 8.8: Gorbachev's 1985 reforms (glasnost, perestroika, intended to save the Soviet system) unintentionally exposed its dysfunction; the Berlin Wall fell November 9, 1989; the USSR formally dissolved December 8–25, 1991 — multiple compounding pressures, not one single cause.
Unit 8.9 — Causation in the Age of the Cold War and Decolonization
Topic 8.9 closes Unit 8 with causation and synthesis: sorting causes by time horizon (structural, medium-term, immediate trigger), treating decolonization and Cold War containment as causally linked rather than parallel stories, and comparing regions to show shared forces produced different outcomes.
Unit 9.1 — Advances in Technology and Exchange after 1900
Topic 9.1 opens Unit 9: radio/cellular/internet communication, air travel and shipping containers, petroleum and nuclear energy, and the Green Revolution's combined innovations (high-yield crops, fertilizer, irrigation) that quadrupled global food production 1950–2000.
Unit 9.2 — Technological Advances and Limitations after 1900: Disease
Topic 9.2: the 1918 influenza pandemic (~500 million infected, 50–100 million dead), poverty-associated diseases (malaria, tuberculosis, cholera) as a story of unequal access rather than missing knowledge, and emergent epidemics (HIV/AIDS, Ebola) alongside real medical progress.
Unit 9.3 — Debates about the Environment after 1900
Topic 9.3: population quadrupling (1.5B in 1900 to 6B+ by 2000) drove deforestation, desertification, strained freshwater (~3% usable) and oil depletion (~half consumed), fueling climate-change debates over responsibility, addressed through the Kyoto Protocol (1997) and Paris Agreement (2015).
Unit 9.4 — Economics in the Global Age
Topic 9.4: the 1944 Bretton Woods institutions (IMF for stability, World Bank for development), the WTO (1995) for trade rules, regional agreements (NAFTA, EU, ASEAN), multinational corporations' global supply chains (maquiladoras, Bangladesh garments, Vietnam electronics), and liberalization's uneven benefits.
Unit 9.5 — Calls for Reform and Responses after 1900
Topic 9.5: women's suffrage expanded at different speeds by country (US 1920, Brazil 1932, Turkey 1934, Japan/India 1945, Morocco 1963), the UN's Universal Declaration of Human Rights globalized rights claims, and movements like Négritude, the Green Belt Movement, and caste reservation in India challenged entrenched inequality.
Unit 9.6 — Globalized Culture after 1900
Topic 9.6: Hollywood's global reach as American cultural-economic power extended, Bollywood as glocalization (global formats filled with local content) rather than homogenization, and the mechanisms (technology, migration, entertainment exports, consumer brands like McDonald's) behind globalized culture.
Unit 9.7 — Resistance to Globalization after 1900
Topic 9.7: the 1999 Seattle WTO protests (Nov. 30–Dec. 3, ~40,000 protesters) as organized economic resistance, religious fundamentalism resisting secularization and cultural change itself, and local alternatives like China's Weibo — plus the darker currents of ethnic violence and extreme nationalism accompanying integration.
Unit 9.8 — Institutions Developing in a Globalized World
Topic 9.8: the UN, IMF, World Bank, and WTO as permanent multilateral institutions managing globalization, NGOs like Doctors Without Borders (1971) operating outside state control, and regional organizations (EU, ASEAN) — the constructive counterpart to Topic 9.7's resistance movements.
Unit 9.9 — Continuity and Change in a Globalized World
Topic 9.9 closes the entire AP World History course with the CCOT skill: technology genuinely transformed communication, medicine, agriculture, and economics from 1900 to the present, while religious identity, social hierarchy, class inequality, and uneven regional wealth persisted — echoing continuities traced since Unit 1.