Overview
Comparison is the AP World skill of explaining meaningful similarities and differences between historical developments, processes, regions, states, or sources. The College Board places comparison under Skill 5: Making Connections, along with causation and continuity/change over time.
Comparison appears across the AP World exam. Multiple-choice questions may ask which development is most similar to another. SAQs may ask for one similarity and one difference. DBQs and LEQs may ask you to evaluate the extent to which two developments were similar or different.
Good comparison is not a random list. It uses a clear category, gives specific evidence for both sides, and explains why the similarity or difference matters.
What Comparison Means
Comparison asks three questions:
- What is similar?
- What is different?
- Why is that similarity or difference historically significant?
A weak comparison says, "The Ottoman and Mughal Empires were similar and different." A strong comparison names the category.
Stronger comparison:
The Ottoman and Mughal Empires were similar because both used Islamic legitimacy and military elites to govern diverse populations. They differed in religious policy because the Ottoman millet system organized non-Muslim communities with some legal autonomy, while Mughal policies varied more sharply by ruler, especially between Akbar's tolerance and Aurangzeb's stricter Islamic policies.
That answer works because it compares the same category: religion and governance. It also gives evidence for both empires.
Pick a Category First
The most important comparison habit is choosing a category before you write. A category keeps your answer from becoming a list of disconnected facts.
Useful AP World comparison categories include:
| Category | Questions to ask |
|---|---|
| Political | How did states govern, claim legitimacy, or control territory? |
| Economic | How did societies produce, trade, tax, or use labor? |
| Social | How were people organized by class, gender, race, ethnicity, religion, or status? |
| Cultural | How did belief systems, education, art, or intellectual life shape society? |
| Technological | What tools or innovations changed production, trade, war, or communication? |
| Environmental | How did geography, disease, crops, resources, or climate shape outcomes? |
For example, comparing the Aztec and Inca empires by "they were both in the Americas" is too basic. Comparing them by political organization is stronger: both built large empires, but the Aztec relied heavily on tribute from conquered peoples while the Inca used a more centralized administrative system and labor obligations such as the mita.
Similarities and Differences
Many students find differences first because they are more visible. Similarities often require a broader view.
Example: British and Japanese industrialization from 1750 to 1900.
| Category | Similarity | Difference |
|---|---|---|
| Economic change | Both industrialized and expanded factory production. | Britain industrialized earlier through private capital, coal, and textile production, while Japan industrialized later through strong state direction after the Meiji Restoration. |
| Global power | Both used industrial strength to expand influence. | Britain built a global maritime empire, while Japan focused first on regional expansion in East Asia. |
| Social effects | Both experienced urban growth and new labor patterns. | Britain's working class developed over a longer period, while Japan's changes were compressed into a shorter state-led reform era. |
Notice that each row compares the same category. That makes the answer easier to follow and easier to defend.
Explain Why the Comparison Matters
The AP exam often rewards explanation, not just identification. After naming a similarity or difference, add the reason it matters.
Weak:
India and Vietnam both decolonized, but one was peaceful and one was violent.
Stronger:
India and Vietnam both decolonized after World War II, but their paths differed because Britain was weakened by the war and faced a long-organized Indian independence movement, while France tried to reassert control in Indochina and faced armed resistance from Vietnamese nationalists and communists. The difference matters because decolonization was shaped by both local movements and the choices of imperial powers.
The stronger version explains why the outcomes differed and connects the comparison to a larger AP World pattern.
Comparison in DBQs and LEQs
For a comparison essay, your thesis should name both sides, identify the category, and make a defensible claim about similarity, difference, or degree.
Example prompt frame:
Evaluate the extent to which land-based empires and maritime empires used similar methods to maintain power in the period 1450 to 1750.
Basic thesis:
Land-based and maritime empires had similarities and differences in how they maintained power.
Stronger thesis:
From 1450 to 1750, land-based and maritime empires both used military force, taxation, and claims of legitimacy to maintain power, but they differed in the sources of that power. Land-based empires such as the Ottoman and Qing relied more on territorial administration and established elites, while maritime empires such as Spain and Portugal relied more on overseas colonies, coerced labor, and control of trade routes.
The stronger thesis sets up categories for body paragraphs: military power, legitimacy, administration, labor, and trade.
Sentence Frames That Work
Use comparison language that forces you to discuss both sides.
- Both... and... because...
- While... relied on..., ... relied more on...
- A major similarity was...
- A major difference was...
- This similarity mattered because...
- This difference was significant because...
- Although both..., they differed in...
Avoid wording that compares only one side. If a sentence names the Ottoman Empire but never mentions the Safavid or Mughal Empire, it may be evidence, but it is not yet comparison.
High-Value AP World Comparisons
These comparison pairs come up often because they connect directly to major course patterns.
| Pair | Strong category |
|---|---|
| Song China and Dar al-Islam | bureaucracy, trade, scholarship, belief systems |
| Silk Roads and Indian Ocean trade | technology, goods, merchant communities, state support |
| Land-based and maritime empires | legitimacy, administration, labor, trade routes |
| Spanish and Portuguese empires | colonization, labor systems, religion, trade |
| Ottoman, Safavid, and Mughal Empires | Islamic rule, military elites, religious diversity |
| British and Japanese industrialization | state role, timing, resources, social effects |
| India and Vietnam decolonization | nationalist movements, imperial response, Cold War context |
| United States and Soviet Union in the Cold War | ideology, alliances, proxy wars, economic systems |
You do not need to memorize a perfect paragraph for every pair. You need to practice choosing a category and defending it with accurate evidence.
Common Mistakes
- Comparing unrelated facts. "The Ottoman Empire used janissaries, and Spain conquered the Aztec Empire" is not a comparison unless you connect both to a shared category.
- Only writing differences. Many prompts ask for similarities and differences, so do both when possible.
- Using one-sided evidence. A comparison needs evidence for each side.
- Forgetting context. Similar-looking developments can happen for different reasons depending on time, place, and historical situation.
- Overclaiming. Avoid "completely different" or "exactly the same" unless the evidence truly supports it.
Practice
For each pair, choose one category of comparison, write one similarity, write one difference, and explain which one matters more.
- Compare the Silk Roads and Indian Ocean trade from 1200 to 1450.
- Compare the Ottoman and Mughal Empires in the period 1450 to 1750.
- Compare Spanish colonization in the Americas with Portuguese trading-post empire-building in the Indian Ocean.
- Compare industrialization in Great Britain and Japan.
- Compare decolonization in India and Algeria or Vietnam.
Before you finish, check your paragraph with one question: did you compare the same category on both sides? If yes, your comparison is probably on the right track.