AP Comparative Government and Politics / Political Systems, Regimes, and Governments
Lesson
State, regime, government
Three layers of political organization that students often flatten into one word.
Learning goals
- Distinguish a state from a regime and a government.
- Explain why an election can change a government without changing a regime.
Explanation
A state is a political organization that claims a monopoly on legitimate force inside a territory. A regime is the lasting set of rules about how power is gained and used—constitutions, party systems, and unwritten habits. A government is the set of people currently holding office.
The United Kingdom can change prime ministers without becoming a different kind of political system. Mexico can rotate presidents inside a federal republic. By contrast, a revolution or a military takeover can replace the regime itself. Keep the layer you are describing labeled.
Key terms
- Regime. The durable rules and practices that determine how political power is obtained and exercised.
- Government. The people and offices that currently make and enforce policy.
Common mistakes
- Calling every leadership change a regime change.
- Using “country,” “state,” and “nation” as if they were identical.
Practice
Original Marlow Works items. Check the answer explanation after you try.
Which comparison of regime type is most accurate for the AP Comparative course countries?
Original Marlow Works item — not a College Board question.
Take your time—this is practice, not a test.
Answer explanation
Iran holds a presidential election. Which layer most clearly changed if the new president takes office under the same constitutional order?
Answer. The government, because officeholders changed inside the existing Islamic Republic regime.
Elections can rotate executives without rewriting the rules of the system.
Related resources
External links with reuse status. Marlow Works is independent and does not copy restricted exam or textbook material.
Official / link only
AP Comparative Government and Politics course page
Official five-unit framework and country comparison scope.
College Board · All rights reserved · accessed 2026-10-01
Open sourceCC BY — attribution required
Introduction to Political Science
Open political science background for institutions and behavior.
Open Textbook Library listing · CC BY · accessed 2026-10-01
Open source