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AP World History: Modern — Cheatsheet

Formulas, exam-day tips, and key terms on one page.

On the exam

When a prompt asks how a state "consolidated" power, name a concrete institution (exams, bureaucracy, tax system, standing army) and then explain the *mechanism* — how it actually extended the ruler’s control. Naming without explaining rarely earns the point.
For any comparison prompt, run the **five tools** — religious claim, bureaucracy, monumental display, tribute or tax, local intermediaries — and ask which each state leaned on hardest. That gives you a similarity and a difference in under a minute, which is exactly what the comparison point requires and what students usually flail for.
For any trade-route question, connect the *type of transport* to the *type of goods*. Overland routes (Silk Roads) carried high-value luxuries; sea routes could carry heavier bulk goods more cheaply. This transport-cost logic is a reliable analytical move on the exam.
The plague is the exam's favorite illustration of a **network effect**: the same connectivity that raised prosperity created the vulnerability. If you can state that in one sentence and then give a specific consequence — wages rising, serfdom eroding, communities scapegoated — you have the causation point and the complexity point together.
Administration questions reward the *logic* of control: rulers wanted elites who depended on **the state** rather than on **birth or land**. Devshirme, civil-service exams, and controlled tax systems all serve this aim. Explain the loyalty mechanism, not just the name.
For decline prompts, resist "corruption" and "decadence" — they are not mechanisms. Write instead: **revenue captured by intermediaries + rising military costs + inflation = fiscal crisis**. That sentence works for the Ottomans, the Mughals, the Safavids and the Qing, and it is a causal argument rather than a moral judgment.
On the exam, be precise about *direction*. American-origin items (maize, potatoes, tomatoes, cacao, tobacco) went **east**; Old World crops, animals, and diseases (wheat, sugar, horses, smallpox) went **west**. A single mismatched direction can cost a point.
Sort every causation answer into **motive / means / enabling condition** and give one specific item under each. It takes one line to set up and it guarantees you have named a technology, a desire, and an institution — which is what "multiple causation" means in the rubric.
For revolution comparisons, analyze **who led** and **who benefited**. Elite-led revolutions (American, much of Latin America) often preserved social hierarchies; the **Haitian** revolution, led by the enslaved, uniquely dismantled slavery. That distinction earns comparative-thinking points.
If a prompt asks which revolution was "most radical," **name your criterion first**. By political transformation, France abolished a monarchy and a nobility. By social transformation, Haiti destroyed slavery and a planter class. By durability of institutions, the United States. Declaring the standard is what makes the answer arguable rather than assertive.
Explain imperialism through the *industrial* lens: factories needed raw materials and markets, and industrial *technology* (steamships, railroads, machine guns, quinine) made conquest feasible. Tying imperialism back to industrialization is exactly the causal link this unit tests.
Always include **local allies and indigenous soldiers** in a conquest answer. It is the element most often left out, it is decisive, and it protects you from the mistaken picture of small European armies defeating whole societies unaided.
For total-war questions, show the collapse of the soldier/civilian line: economic conversion, rationing, women in war industry, propaganda, and the deliberate targeting of civilians (strategic bombing, atomic bombs, genocide). Mass mobilization is the through-line of this unit.
This is AP **World** History: an answer about the world wars that names only European and American developments is incomplete by design. Include the **colonial dimension** — troops, labor, resources, and the political expectations created — in every world-war essay.
Write about atrocity with **specifics** — perpetrator, targeted group, approximate scale, mechanism, date range. Vague condemnation earns nothing, and precision here is both a scoring requirement and a form of accuracy the subject demands.
For the Soviet collapse, marshal *multiple* causes: economic stagnation, the arms-race burden, the Afghanistan war, Eastern European pressure, and Gorbachev’s reforms (glasnost and perestroika) that backfired. Layering several factors makes a stronger causation argument than naming just one.
For AP World, always ask what a Cold War conflict looked like **to the people living in it**. Vietnam was an anticolonial war before it was a Cold War front; Angola was a decolonization crisis before it was a proxy war. Naming the local cause first, then the superpower overlay, is the framing that scores.
On culture, hold the tension in both hands: globalization drives **homogenization** *and* provokes **local identity backlash and hybridization**. Naming both sides — the global spread and the local reaction — is exactly the nuanced analysis this final unit rewards.
On globalization, "good or bad" is the wrong question and graders treat it as one. Ask instead **who gained, who lost, and by what mechanism**. Poverty in China fell and industrial wages in the American Midwest stagnated, and both facts have the same cause — that sentence is the argument.

How to get a 5

Anchor every essay in specific evidence — names, dates, places (Potosí silver, Meiji Restoration, Berlin Conference); vague generalizations rarely earn the evidence points.
Use the reasoning skills explicitly: structure body paragraphs around causation, comparison, or continuity-and-change to lock in the analysis point.
Earn complexity by comparing across two+ regions or showing a development's opposite effects in different places — then say so directly.
For the DBQ, source at least three documents with HIPP (Historical situation, Intended audience, Point of view, Purpose).
Anchor every claim to a named place and date. AP World readers cannot award credit for “an empire” or “a trade network” — write “the Safavid Empire under Shah Abbas” or “Kilwa in the fourteenth century.” Regional specificity is the single highest-yield habit on this exam.
Practice the three reasoning processes as sentence templates. Causation: “X occurred because Y, which produced Z.” Comparison: “Both A and B did X, but A did so through Y while B relied on Z.” Continuity and change: “Although X persisted, Y changed because…” Writing in these forms makes your reasoning visible to a reader scanning quickly.
For sourcing on the DBQ, use the historical situation of the document as your default move. Asking what pressure the author was under when writing — a wartime shortage, a colonial emergency, an audience of potential allies — almost always yields a sharper point than guessing at personal bias.
Learn the unit date ranges as hard filters. Many wrong answers are true statements from the wrong period: horses in the pre-contact Americas, quotas before 1921, railroads before 1750. If a choice names a technology or institution outside the stem’s dates, eliminate it immediately.
Complexity points come from tension, not length. Name a counterexample or a group for whom the pattern fails — a region that industrialized differently, a population excluded from a reform — and then explain why the overall judgment still holds. One well-developed qualification beats three extra body paragraphs.

Key terms

Mandate of Heaven — Chinese belief that Heaven grants rulers the right to govern by virtue; disasters or rebellion signal its loss and justify dynastic change.

Dar al-Islam — The lands under Muslim rule and the shared civilization of law, learning, and language within them. Significance: after the Abbasid collapse, scholars, merchants, and Sufis maintained cultural and commercial unity across politically fragmented states from Spain to Southeast Asia.

Silk Roads — Overland Eurasian routes carrying luxury goods, and more consequentially religions, technologies and disease. Revived under Mongol protection.

Pax Mongolica — Roughly a century of relative security across Mongol-controlled Eurasia, supported by the yam relay system. Significance: enabled travel by figures such as Marco Polo, Ibn Battuta, and Rabban Bar Sauma, and moved gunpowder, printing, and medical knowledge westward — along with the plague.

Gunpowder empires — Ottoman, Safavid, Mughal, and Qing states that used firearms and artillery to conquer and centralize. Significance: cannon overcame the fortifications that had protected regional lords, allowing rulers to absorb rivals and build large multiethnic land-based empires.

Columbian Exchange — Transfer of crops, animals, people, and pathogens between the Americas and Afro-Eurasia after 1492. Significance: catastrophic Indigenous mortality created the labor demand that drove African enslavement, while American staples supported population growth across Eurasia and Africa.

Mercantilism — The doctrine that global wealth is fixed, so states should export more than they import and hold colonies as suppliers and captive markets.

Encomienda system — Spanish labor system granting colonists the right to demand Indigenous labor and tribute — coercive and often deadly.

Enlightenment — Application of reason to human affairs — natural rights, social contract, separation of powers — supplying the vocabulary of every revolution in this unit.

New imperialism — Late nineteenth-century European conquest of Africa and Asia, driven by raw materials, markets, strategic rivalry and racial ideology.

Total war — Mobilization of a state’s entire economy, population, and propaganda apparatus for war, as in 1914–1918 and 1939–1945. Significance: erased the front–home front distinction, expanded state power and women’s wage employment, and made civilians targets, culminating in strategic bombing and the atomic bomb.

Decolonization — Post-1945 independence of African/Asian colonies, sometimes peaceful (India), sometimes violent (Algeria).

Neo-Confucianism — Song-era synthesis of Confucian ethics with Buddhist and Daoist metaphysics, associated with Zhu Xi. Significance: justified hierarchy, filial piety, and female subordination (including foot binding); became the state orthodoxy of China and spread to Korea, Japan, and Vietnam.

Civil service examination system — Competitive tests on the Confucian classics used to recruit officials, greatly expanded under the Song. Significance: created a scholar-gentry elite loyal to the dynasty rather than to hereditary landholding, and offered one of the premodern world’s few institutional channels of social mobility.

Kamakura shogunate and bushido — Japanese military government (1185–1333) in which shoguns ruled through daimyo and samurai bound by the bushido warrior code. Significance: the emperor became ceremonial while real power rested on decentralized land-for-service ties — a common point of comparison with European feudalism.

Caravanserai — Roadside inns spaced about a day’s travel apart along Silk Road and trans-Saharan routes. Significance: their spread after 1200 lowered the risk and cost of overland trade and made towns into nodes of cultural and technological transmission.

Swahili city-states — Coastal East African trading towns such as Kilwa, Mombasa, and Sofala. Significance: exported gold, ivory, and enslaved people into the Indian Ocean system; their Bantu-Arabic Swahili language and Islamic urban culture show how commerce produced syncretic societies.

Indian Ocean monsoon trade — Commerce structured by seasonally reversing winds, carried in dhows and junks. Significance: predictable timing made round-trip voyages calculable, encouraging merchant diasporas, credit institutions, and the peaceful spread of Islam into East Africa and Southeast Asia.

Black Death (1330s–1350s) — Plague pandemic that spread along Mongol-secured trade routes, killing perhaps one third of Europe and comparable shares in Southwest Asia and North Africa. Significance: labor scarcity weakened serfdom and raised wages in Europe, and demonstrated the demographic cost of Eurasian integration.

Devshirme and janissaries — Ottoman levy of Christian boys who were converted, trained, and placed in elite military and administrative posts. Significance: created a professional standing army and bureaucracy dependent on the sultan, counterbalancing the hereditary Turkish nobility.

Safavid Twelver Shi’ism — Shah Ismail’s imposition of Twelver Shi’a Islam as the Safavid state religion after 1501. Significance: gave Persia a durable religious identity distinct from its Sunni Ottoman and Mughal neighbors, and fused dynastic legitimacy with sacred lineage.

Encomienda and the mit’a — Spanish grants of Indigenous labor and tribute, and the repurposed Inca rotational labor draft used at Potosí. Significance: show colonizers adapting both European and existing Andean institutions to extract silver and agricultural labor before African slavery predominated.

Manila galleon and the silver trade — Annual Spanish voyages carrying American silver from Acapulco to Manila in exchange for Chinese silk and porcelain. Significance: linked American mines to Chinese demand for silver tax currency, closing the first sustained global trade circuit and fueling inflation in Spain.

Middle Passage — The transatlantic leg of the slave trade that carried roughly twelve million Africans, with mortality often above ten percent per voyage. Significance: supplied plantation labor for sugar, tobacco, and coffee; transformed West African politics; and created lasting African diasporic cultures in the Americas.