AP Comparative Government is built around six countries: China, Iran, Mexico, Nigeria, Russia, and the United Kingdom. Knowing each country's institutions, regime type, and key features is the foundation for every comparison the exam asks you to make.
Use the country topic guides below to review each case, then practice placing them side by side across regime type, electoral system, executive structure, and economic model.
The six countries were selected because they represent distinct regime types, institutional arrangements, and development paths. No two countries are identical, and the exam rewards students who can explain why differences exist, not just list them.
China demonstrates one-party rule, rule by law, and state-directed economic liberalization through SEZs. Iran shows theocratic authoritarianism where the unelected Supreme Leader and Guardian Council override elected institutions. Russia is the competitive authoritarian case: elections exist but are managed, civil liberties are restricted, and United Russia dominates the Duma.
Mexico transitioned away from PRI single-party dominance through electoral reforms and an independent election commission, making it the go-to case for gradual democratization. Nigeria transitioned from military rule to a multiparty presidential republic in 1999, and it illustrates federalism in a divided society, the resource curse, and the challenges of consolidating democracy.
The UK anchors the democracy side of nearly every comparison. Its parliamentary system, fusion of executive and legislative power, unitary structure with devolution, common law judiciary, and free media make it the standard reference for rule of law and democratic accountability. It is also the only constitutional monarchy among the six countries.
AP Comparative Government is not six separate country courses. The point is to use countries as evidence for broader claims about how regimes work, how power is structured, and how states respond to citizens. When you study each country, always ask: what does this case prove or illustrate that another case does not?
China shows how an authoritarian regime can maintain stability through party control of institutions, censorship, and selective economic liberalization. Key exam contrasts: China vs. UK on rule of law, China vs. Russia on party structure, China vs. Iran on economic policy.
Iran's layered system of unelected religious authority over elected republican institutions is unique among the six countries. The Guardian Council's veto power over candidates and legislation is the most-tested feature. Pair Iran with Nigeria on rentier state economics.
Mexico's shift from PRI hegemony to multiparty competition through institutional reform (especially the INE) is the course's clearest democratization story. Use Mexico to illustrate how electoral institutions shape regime change. Compare with Nigeria on presidential federalism.
Nigeria combines a presidential federal system with deep ethnic and religious divisions and oil-dependent revenues. The 2015 peaceful transfer of power from PDP to APC is a key democratization milestone. Compare with Iran on rentier state dynamics and with Mexico on presidential federalism.
Russia is the only semi-presidential system in the course and the clearest example of competitive authoritarianism. Elections occur but outcomes are controlled. Use Russia to contrast with the UK on democratic accountability and with China on the role of formal opposition.
The UK is the benchmark democratic case. Its parliamentary system, independent judiciary, free media, and devolved unitary structure appear in nearly every democracy-side comparison. Use the UK to anchor FRQ 3 whenever the prompt asks for a democratic contrast.
Compare all six AP Comparative Government countries (China, Iran, Mexico, Nigeria, Russia, UK) across regimes, institutions, elections, courts, and economies.
China is the course's clearest example of authoritarian one-party rule. The Chinese Communist Party controls the government, military, and media. Formal institutions like the National People's Congress exist but operate under party direction. Economic policy combines state control with market liberalization through Special Economic Zones.
| Feature | China | UK contrast |
|---|---|---|
| Regime type | One-party authoritarian | Parliamentary democracy |
| Legislature role | Approves CCP decisions | Independently legislates |
| Judiciary | Party-controlled | Independent common law courts |
| Media | State-censored | Free and independent |
| Elections | Indirect, no multiparty competition | Free, fair, competitive |
Iran is the course's only theocracy. After the 1979 Revolution, religious authorities gained supreme power over elected institutions. The Supreme Leader outranks the elected president, and the Guardian Council can disqualify candidates before elections occur. Iran is also the only course country without formal political parties.
| Feature | Iran | Mexico contrast |
|---|---|---|
| Regime type | Theocratic authoritarian | Democratizing republic |
| Candidate screening | Guardian Council disqualifies candidates | INE ensures fair access |
| Head of state | Supreme Leader (unelected) | President (elected) |
| Political parties | None formal | Multiparty competition |
| Revenue base | Oil rentier state | Diversified economy |
Mexico's defining story is transition: from PRI single-party dominance for most of the 20th century to genuine multiparty competition after electoral reforms in the 1990s. It is one of two presidential systems and one of three federal states among the six countries. The creation of an independent electoral commission (INE) is the key institutional reform to know.
| Feature | Mexico | Nigeria comparison |
|---|---|---|
| Regime type | Democratizing republic | Democratizing republic |
| Executive system | Presidential | Presidential |
| State structure | Federal | Federal |
| Transition from | Single-party (PRI) dominance | Military rule |
| Key challenge | Corruption, drug cartel influence | Ethnic cleavages, resource curse |
Nigeria transitioned from military rule to a multiparty republic in 1999. It is the course's primary case for federalism in a deeply divided society, the resource curse, and the challenges of democratic consolidation. The 25% rule for presidential elections and the rotation of power between north and south are unique institutional features.
| Feature | Nigeria | Iran comparison |
|---|---|---|
| Regime type | Democratizing republic | Theocratic authoritarian |
| Revenue source | Oil rentier state | Oil rentier state |
| Elections | Competitive multiparty | Screened by Guardian Council |
| Religious influence | Sharia law in northern states | Sharia law governs entire state |
| Civil society | Active but constrained | Heavily restricted |
Russia is the course's example of a managed or illiberal democracy: elections are held but not genuinely competitive, civil liberties are restricted, and United Russia dominates the State Duma. Russia is the only semi-presidential system among the six countries, meaning executive power is formally shared between a president and a prime minister.
| Feature | Russia | UK contrast |
|---|---|---|
| Regime type | Competitive authoritarian | Parliamentary democracy |
| Executive structure | Semi-presidential | Parliamentary (PM from legislature) |
| Elections | Held but manipulated | Free and fair |
| Judiciary | Not independent | Independent |
| Media | State-dominated | Free and independent |
The UK is the democratic anchor of the course. Its parliamentary system fuses executive and legislative power through the prime minister and cabinet, who must maintain a Commons majority. The UK is a unitary state with devolution to Scotland, Wales, and Northern Ireland. It uses first-past-the-post elections and has an independent common law judiciary.
| Feature | UK | Russia contrast |
|---|---|---|
| Regime type | Parliamentary democracy | Competitive authoritarian |
| Executive accountability | PM accountable to Commons | President dominates, limited accountability |
| State structure | Unitary with devolution | Federal in name, centralized in practice |
| Judiciary | Independent | Not independent |
| Elections | Free, fair, FPTP | Held but manipulated |
Russia holds elections, but the exam classifies it as competitive authoritarian or managed democracy because those elections are not free or fair. United Russia's dominance, candidate suppression, and media control are what matter. Do not confuse the presence of elections with democratic legitimacy.
Iran's president is the head of government, not the head of state. The Supreme Leader holds supreme authority and outranks the president on military, foreign policy, and judicial matters. The Guardian Council, not the president, controls who can run for office.
Both are democratizing presidential federal republics, but their transitions differ. Mexico transitioned from single-party civilian rule; Nigeria transitioned from military rule. Nigeria also has ethnic cleavages and a rentier economy that Mexico does not share to the same degree. FRQ 3 will penalize generic answers that ignore these distinctions.
The UK is a unitary state. Devolution transfers specific powers to Scotland, Wales, and Northern Ireland, but Westminster retains sovereignty and could theoretically reclaim those powers. In a federal system like Mexico or Nigeria, subnational governments have constitutionally guaranteed powers the center cannot unilaterally remove.
The National People's Congress exists and formally passes laws, but it operates under CCP direction. Describing the NPC as a functioning independent legislature is inaccurate. The real power sits in the Politburo Standing Committee, not the NPC.
Roughly 25-32% of MCQs involve country comparison. Questions may describe an institutional feature (a Guardian Council vetting candidates, a semi-presidential executive, a rentier economy) and ask you to identify the country or explain the implication. Knowing each country's defining features precisely, not just generally, is what separates correct answers from close misses.
FRQ 3 is entirely devoted to comparing two countries on a specific political feature. You must identify a similarity or difference, explain why it exists using course concepts, and often evaluate a consequence. The strongest responses name specific institutions (the Guardian Council, the INE, the State Duma), not just regime labels. Use the country topic guides to build a bank of specific institutional evidence for each country.
FRQs 1 and 2 often ask about a single country's institutions, elections, or political behavior. You may be asked to describe how a specific institution works (China's NPC, Iran's Majles, Nigeria's 25% rule), explain a political outcome, or apply a concept like federalism or rule of law to a specific case. Reviewing each country's topic guide ensures you have the institutional detail these questions require.
Open the individual guides for Review by country when you want a closer review of one topic.
browse guidesPractice free-response reasoning and compare your answer with scoring guidance.
practice FRQsWatch past review streams filtered to Review by country when you want a video walkthrough.
open videosUse unit cheatsheets for a quick visual review after you work through the notes.
open cheatsheetsEstimate your broader AP score goal after you review the course and exam format.
open calculatorThe AP Comp Gov review-by-country progress check includes MCQ and FRQ parts that test your ability to compare political systems, institutions, and policies across the six course countries: China, Iran, Mexico, Nigeria, Russia, and the United Kingdom. MCQs ask you to identify and contrast regime types, electoral systems, and civil liberties. FRQs typically ask you to compare two countries on a specific concept, like legislative structure or the role of political parties. Check /ap-comp-gov/review-by-country for practice aligned to these progress check topics.
To practice AP Comp Gov review-by-country FRQs, focus on the comparison and argument essay question types, which ask you to analyze two of the six countries (China, Iran, Mexico, Nigeria, Russia, UK) on topics like executive power, judicial independence, or civil society. Practice by writing out country-specific evidence for each concept, then connecting it to a broader political science claim. Strong FRQ answers name specific institutions, leaders, or policies, not just general descriptions. Visit /ap-comp-gov/review-by-country to find country-by-country breakdowns that map directly to FRQ prompts.
You can find AP Comp Gov review-by-country MCQs and practice test questions at /ap-comp-gov/review-by-country. That page organizes practice by country, so you can drill China, Iran, Mexico, Nigeria, Russia, or the UK individually before tackling mixed comparison questions. For the best results, use MCQ practice to test recall of specific facts (like Iran's Guardian Council or Mexico's PRI history), then move to FRQ-style prompts to practice applying those facts in comparisons.
Study AP Comp Gov review by country by building a comparison chart for all six countries across the same set of categories: regime type, executive structure, legislative system, judicial independence, electoral system, and civil liberties. This makes it easy to spot contrasts on exam day. Start with the UK and Mexico as anchor cases since they represent parliamentary and presidential systems clearly, then layer in China, Russia, Iran, and Nigeria as variations. Review one country at a time, then quiz yourself by comparing two countries on a single concept. Use /ap-comp-gov/review-by-country to check your understanding country by country before doing full mixed practice.