The Chamber of Deputies is the lower house of Mexico's bicameral national legislature, with 500 members elected through a mixed system that combines single-member district plurality seats and proportional representation seats, making it a core AP Comp Gov example of legislative structure and electoral rules.
The Chamber of Deputies (Cámara de Diputados) is the lower house of Mexico's Congress. Mexico is one of the AP Comp Gov course countries with a bicameral legislature, so the Chamber of Deputies sits alongside an upper house, the Senate. Its 500 members are chosen through a mixed electoral system. Most seats come from single-member districts decided by plurality (first-past-the-post), and the rest are filled through proportional representation from party lists. That mix is the detail the exam loves, because it shows a country deliberately blending two democratic logics. SMD seats keep a direct link between a deputy and a local district, while PR seats let smaller parties win representation roughly matching their share of the vote.
Functionally, the Chamber of Deputies does what lower houses do in presidential systems. It debates and passes legislation, controls the budget, and checks the separately elected president. Because Mexico is a presidential system (PAU-3.A.2), the Chamber doesn't choose or casually remove the executive the way the UK House of Commons can with a vote of no confidence. The president serves a fixed term, and removal requires a formal impeachment-style process rather than a simple loss of legislative support.
The Chamber of Deputies shows up across two units. In Unit 2 (Political Institutions), it grounds LO 2.6.A on legislative structures and functions, since Mexico's bicameralism contrasts directly with the unicameral National People's Congress in China and the unicameral Majles in Iran. It also supports LO 2.1.A, because the Chamber's fixed-term, separately elected relationship to the president is exactly what defines a presidential system, and LO 2.5.A, because legislative removal of the executive works through impeachment rather than no-confidence votes. In Unit 4 (Party and Electoral Systems), it's the textbook case for LO 4.1.A on electoral systems. Mexico's mixed SMD-plus-PR formula for the Chamber is one of the clearest examples in the course of how election rules shape which parties get into the legislature.
Keep studying AP Comparative Government Unit 2
Bicameral Legislature (Unit 2)
The Chamber of Deputies only makes sense as half of a pair. Mexico splits lawmaking between the Chamber and the Senate, which creates an internal check that unicameral course countries like China and Iran simply don't have.
House of Commons (Unit 2)
Both are elected lower houses, but the Commons can fire the prime minister with a vote of no confidence because the UK is parliamentary. The Chamber of Deputies can't do that to Mexico's president, who is elected separately and serves a fixed term. Same type of institution, totally different relationship to the executive.
Electoral Systems and Rules (Unit 4)
The Chamber's mixed system is Unit 4 in action. SMD plurality seats tend to favor big parties and local accountability, while the PR seats give smaller parties a real path into the legislature. Mexico runs both at once on purpose.
Removal of Executives (Unit 2)
Under LO 2.5.A, legislatures across course countries can remove executives, but the procedure depends on the system. The Chamber of Deputies participates in impeachment-style removal, a high bar compared to the routine no-confidence mechanism in parliamentary systems.
Multiple-choice questions use the Chamber of Deputies in two main ways. First, comparison stems, like asking what structural feature Mexico's Congress shares with China's National People's Congress but not the UK Parliament, or how splitting powers between the Chamber and the Senate reflects checks and balances. Second, electoral-system stems, like asking how the Chamber's mixed SMD-plus-PR design balances competing democratic principles (local representation versus proportional fairness). On FRQs, this term is most useful in the Comparative Analysis question. If you're asked to compare legislative structures or electoral rules across course countries, the Chamber of Deputies is your go-to Mexico example. Be ready to name the system type (mixed), the chamber type (lower house of a bicameral legislature), and the regime type it operates in (presidential).
Both are elected lower houses, so students mix them up. The difference is the system around them. The House of Commons sits in a parliamentary system, so it selects the head of government and can remove them through a no-confidence vote. The Chamber of Deputies sits in Mexico's presidential system, so the president is elected separately, serves a fixed term, and can only be removed through impeachment. Also, the Commons is elected purely by single-member plurality, while the Chamber of Deputies uses a mixed system with both SMD and proportional representation seats.
The Chamber of Deputies is the lower house of Mexico's bicameral Congress, paired with the Senate as the upper house.
Its 500 members are elected through a mixed system, with 300 single-member district plurality seats and 200 proportional representation seats.
Because Mexico is a presidential system, the Chamber cannot remove the president with a no-confidence vote; removal requires an impeachment-style process.
Mexico's bicameralism contrasts with the unicameral legislatures of China (National People's Congress) and Iran (Majles), a classic comparison point under LO 2.6.A.
The mixed electoral system is designed to balance local district accountability with proportional representation for smaller parties, which is the core idea behind LO 4.1.A.
It's the lower house of Mexico's bicameral national legislature, with 500 members elected through a mixed system of 300 single-member plurality districts and 200 proportional representation seats. It passes laws, controls the budget, and checks Mexico's separately elected president.
Not with a no-confidence vote. Mexico is a presidential system, so the president serves a fixed term won in a separate popular election. The legislature can only remove the executive through a formal impeachment-style procedure, which is a much higher bar than what parliamentary legislatures like the House of Commons can do.
The Commons chooses and can dismiss the UK's head of government because the UK is parliamentary. The Chamber of Deputies operates in a presidential system, so it doesn't select the executive at all. Their electoral systems also differ, since the Commons uses pure single-member plurality while the Chamber uses a mixed SMD-plus-PR system.
Bicameral. The Chamber of Deputies is the lower house and the Senate is the upper house. That distinguishes Mexico (and the UK) from China and Iran, whose legislatures are unicameral.
To balance two democratic goals. The 300 single-member district seats keep deputies tied to specific local constituencies, while the 200 proportional representation seats make sure smaller parties win seats roughly in line with their national vote share. AP practice questions frame this as balancing competing democratic principles.